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US2420845A - Short exposure x-ray apparatus - Google Patents

Short exposure x-ray apparatus Download PDF

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Publication number
US2420845A
US2420845A US540383A US54038344A US2420845A US 2420845 A US2420845 A US 2420845A US 540383 A US540383 A US 540383A US 54038344 A US54038344 A US 54038344A US 2420845 A US2420845 A US 2420845A
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United States
Prior art keywords
cathode
ray tube
voltage
discharge
lamentary
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Expired - Lifetime
Application number
US540383A
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English (en)
Inventor
Charles M Slack
Louis F Ehrke
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CBS Corp
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Westinghouse Electric Corp
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Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US540383A priority Critical patent/US2420845A/en
Priority to GB14790/45A priority patent/GB599273A/en
Application granted granted Critical
Publication of US2420845A publication Critical patent/US2420845A/en
Priority to FR947227D priority patent/FR947227A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/10—Power supply arrangements for feeding the X-ray tube
    • H05G1/22—Power supply arrangements for feeding the X-ray tube with single pulses
    • H05G1/24—Obtaining pulses by using energy storage devices

Definitions

  • the present invention relates to X-ray apparatus and more particularly to such apparatus for the making of X-ray photographs in a time range not heretofore practical.
  • Apparatus for the making of short exposure radiographs is now well known to the art in which the X-ray tube excitation energy is stored in condensers until the making of the radiograph is desired.
  • Some type of switching device such as a control grid of the X-ray tube, a high voltage trigger tube, or a spark-gap, then operates to cause discharge of the condensers through the X-ray tube thereby energizing the latter.
  • Another object of the present invention is the provision of an X-ray apparatus for making short exposure radiographs ranging from .01 to .0001 of a second in which the X-ray tube lament heating together with the voltage and capacities of the X-ray tube energizing condensers are used to control the exposure.
  • Another object of the present invention is the provision of an X-ray apparatus for making short exposure radiographs wherein the time period of exposure ranges from .01 to .0001 of a second with control of the X-ray tube being eiiected by the sudden heating of the filamentary cathode.
  • Another object of the present invention is the provision of an X-ray apparatus for making short exposure radiographs wherein the X-ray tube excitation energy is supplied by high voltage condensers with discharge thereof through the tube being controlled by the temperature of the lamentary cathode of the X-ray tube which is suddenly raised by discharge of a condenser therethrough without distortion of the cathode.
  • Figure 1 is a diagrammatic illustration oi our X-ray apparatus constructed in accordance with the present invention
  • Figure 2 is a graphic illustration showing the relationship between exposure time and voltage of the lainentary cathode energizing condenser at different capacities.
  • Figure 3 is a diagrammatic view similar to Fig. 1 but showing a slight modification which the X- ray tube energizing portion of the apparatus may take;
  • Figure 4 is a view similar to Fig. 3 but showing another modification of the same portion of the apparatus
  • Figure 5 is also a view similar to Fig. 3 but showing a still further modication which the X-ray tube energizing portion of the present X- ray apparatus may take;
  • Figure 6 is a partial cross-sectional view showing a modification which the lamentary cathode of the X-ray tube employed with the apparatus of the present invention, may take.
  • the X-ray apparatus of the present invention as shown in Fig. 1 comprises an X-ray tube 5 provided with the usual anode 6 and lamentary cathode 1.
  • Energy for the X-ray tube is shown as supplied by a high voltage transformer 8 having its primary winding 9 connected to a source of electrical energy of the customary potential of 115-230 volts.
  • the high voltage secondary winding IFJ is grounded in the center and one end thereof is connected, through a rectifying Valve tube I2 and resistance I3, to one plate of a high voltage condenser I, while the remaining end of the secondary winding is similarly connected, through an oppositely connected rectifying valve tube I5 and resistance I5, to one plate of another condenser II.
  • each condenser Since the remaining plates of the condensers I4 and I 'I are grounded as shown, each condenser is charged during one half wave of the alternating current source with the full voltage available across the secondary winding I5. During energization of the X-ray tube 5, these condensers Ifl and I I discharge in series through the X-ray tube in the manner shown by the heavy lines in Fig. 1.
  • the rllamentary cathode I is arranged 'to be suddenly heated to an electron emitting temperature by energy received from a condenser I8, which may be made variable, if desired, as hereinafter explained.
  • a condenser I8 may be solely employed to supply all of the heating energy for the larnentary cathode 7, it is preferable to heat the same to a temperature just below that where any appreciable electron emission occurs since this enables the amount of energy otherwise required in the condenser ⁇ I8 to be reduced.
  • the cathode 'I is shown in Fig, 1 as receiving a limited amount of energy from a low tension insulation heating transformer I9, the secondary winding 20 of which is connected to the lamentary cathode 7, while its primary winding 22 is connected to the same commercial source of supply as the primary winding 9 of the high voltage transformer 8.
  • the condenser I8 is charged to a desired potential from any suitable source of direct current supply as indicated by the legend, which may comprise a rectifying arrange ⁇ ment similar to that shown for charging the condenser I4 and II but naturally of a much lower voltage, as will be hereinafter more fully explained.
  • the voltage at which the condenser is charged is variable by employing any suitable means, such, for example, as a variable resistance or auto-transformer 52, as shown in Fig. 5.
  • the lamentary cathode In the customary operation of an X-ray tube, its lamentary cathode is usually heated from a source of low voltage, i. e. about ten volts or less, which is suiicient to raise and maintain the cathode at an electron emitting temperature. Contrary to supplying the lamentary cathode with a voltage of the usual magnitude of ten Volts or less, the voltage momentarily applied thereto, in accordance with the present invention, ranges from several times to several hundred times such voltage, depending upon the time period desired for the exposure and the capacity of the filamentenergizing condenser I8, together with the ability of the cathode 'l to resist distortion.
  • a source of low voltage i. e. about ten volts or less
  • the voltage momentarily applied thereto in accordance with the present invention, ranges from several times to several hundred times such voltage, depending upon the time period desired for the exposure and the capacity of the filamentenergizing condenser I
  • this voltage is high voltage in comparison with that customarily applied to a lamentary cathode, it Will be hereinafter referred to as an intermediate voltage for the purpose of distinguishing not only from the usual low voltage of ten volts or less, but also to differentiate from the high voltage supplied by the condensers I4 and II, which is of the magnitude of many kilovolts.
  • a control arrangement which as shown in Fig. 1 comprises a three electrode tube 23 in series with the discharge circuit of condenser I8, which includes the rllamentary cathode 'I of the X-ray tube 5.
  • This tube 23 normally operates to prevent discharge of condenser I3 because of the application of a potential from a source, such as battery 24, through a resistance 25, to the grid electrode of the tube 23, which grid potential is negative with respect to the potential supplied by the battery 24 to the cathode of the tube 23.
  • the grid and cathode of tube 23 are connected through a resistance 26 to the secondary winding 27 of an insulating transformer 23.
  • Energization of the primary winding 29 of this insulating transformer 28 is obtained from the discharge of a further condenser 38 which includes a trigger tube 32 in the discharge circuit in series with the primary winding 29.
  • the condenser 30 is charged with an unidirectional p0- tential from a suitable source which may comprise a low voltage rectifying arrangement similar to that shown for charging the high voltage condensers I4 and I'I as well as for charging of condenser I8.
  • the trigger tube 32 like the tube 23, normally operates to prevent discharge of the condenser 3l] through the primary winding 29.
  • the grid of this tube 32 is supplied with a biasing potential more negative than the potential supplied to the cathode from a suitable source, such as a battery 33 through a normally closed switch 34 and resistance 35.
  • the switch 34 When an X-ray exposure is desired and assuming that all the various condensers I4, I1, IB and 3B have been charged to their respective voltages7 the switch 34 is depressed, thus interrupting the supply of biasing potential to the grid of trigger tube 32 from the source 33.
  • This causes a potential to be supplied to the grid of the tube 32 from a further source, such as a battery 36 through a resistance 31, which is more positive than the potential supplied by this same source to the cathode of tube 32.
  • the latter im-4 mediately becomes conductive allowing the condenser 30 to discharge its accumulated energy through the primary winding 29 of the insulating transformer 28.
  • the secondary winding 21 is accordingly energized by the impulse of energy passing through the primary winding 29 attendant discharge of the condenser 30.
  • the length of the exposure is controlled by either changing the capacity or the voltage, and preferably the latter, of the lamentary-cathodecondenser I8.
  • This may be appreciated by reference to Fig. 2 wherein the ordinate represents exposure time in milliseconds and the abscissa condenser voltage.
  • Curve A represents a lamentary-cathode-condenser I8 of approximately 320 microfarads capacity in which case the low voltage scale should be read whereas curve B is for a lamentary-cathode-condenser I8 of approximately 80 microfarads and taking the high voltage scale on the abscissa. In each instance, however, it will be noted that the time increases as the voltage decreases.
  • the exposure time of the radiograph is determined by the discharge of the high voltage condensers I4 and I'I but under control of the emission temperature of the Iilamentary cathode l as heated by the iilament-energizing condenser I8.
  • the capacity and voltage of the filamentarycathode energizing condenser I8 is governed more or less by the lamentary cathode 1.
  • the lamentary cathode 1 For example, with an ordinary X-ray tube lament as commonly used in present types of X-ray tubes comprising a coil of wire, the latter offers an inductive path to the iiow of current and consequently there is an attractive force between the turns or helices which varies as the square of the current, and which tends to distort the iilamentary cathode.
  • a lamentary cathode structure wherein the magnetic or electrostatic forces applied to the helices are eliminated or at least balanced out so as to avoid possible distortion at high voltage. This may be accomplished in several ways either by stretching the lament to further separate the individual loops or helices, by employing alternate loops and Vs, or by utilizing a double wound non-inductive loop as shown diagrammatically in Fig. 6 wherein the lamentary cathode 1 is wound back upon itself in a direction opposite to the initial winding.
  • the loss of energy due to radiation in the short period of heating of .001 second is such a small percentage of the energy supplied that it may be neglected in calculations. Accordingly, the maximum temperature rise of the fllamentary cathode 'I is dependent only on the energy discharged through it and its heat capacity, without an ensuing distortion, and not appreciably upon the Voltage of the iilament-energizing-condenser I3 when voltages of the magnitude employed are so many times higher than the voltage normally required to maintain the cathode continuously at an electron emitting temperature. This will become obvious ,when it is appreciated that the power radiated by the filament at its melting point is less than one percent of the power applied to lamentary cathode at the lowest charging voltage employed.
  • an X-ray apparatus for the making of short exposure radiographs is herein provided with range from .01 to .0001 of a second duration, thus covering a range not heretofore practical with prior apparatus.
  • the triggering arrangement for suddenly heating the cathode as shown in Fig. 1 is insulated from the high voltage, it is possible to so arrange the apparatus that it operates at or near ground potential, thus dispensing with the necessity for an insulating transformer.
  • the charging circuit for the high voltage condensers can be made so as to charge the same in parallel while they discharge in series through the X-ray tube.
  • a charging circuit for the high voltage condensers I4 and I'I is shown wherein the latter are charged in parallel.
  • these condensers discharge in series, as shown by the heavy lines in Fig. 3, with the voltage of condenser Il breaking down a spark-gap 40, and the X-ray tube being thus supplied with a voltage higher than that available from the transformer 8 with the total voltage dependent upon the number of condensers employed.
  • the triggering arrangement in this instance is identical to that shown in Fig, 1 and connects to the remaining portion of the apparatus at the points M and N as noted in both Figs.
  • This circuit arrangement is only applicable to an X-ray apparatus of the type of the present invention wherein the discharge current passed through the X-ray tube is sufficiently large so that the leakage losses through the various resistances are a small portion of the total current, whereas in attempting to apply the circuit tc ordinary X-ray tubes emitting milliamperes of current as is customary, the leakage back through the resistances is suicient to seriously impair or in fact prevent altogether the production oi X-i'ays.
  • one less spark-gap is required than the number of condensers, in lieu of one spark-gap for each condenser as would be normally required with surge generators, since the X-ray tube itself replaces-the additional sparkgap because of its triggering action which greatly simpliiies the triggering arrangement.
  • Fig. 4 a modification of the high voltage portion of the present invention is shown which enables the triggering and iilament discharge portions of the circuit to be at or Inear ground potential and wherein the total excitation voltage for the X-ray tube can be increased as desired by the addition of condensers.
  • point X asshown in Fig. 4 corresponds to the same point X in Fig. 5, reference may be had to this latter ligure for the charging of the condensers.
  • the condensers ill, il and 43 all discharge in series through the X-ray tube 5, as shown by the heavy lines in Fig. e, with the spark-gaps iii and lill breaking down simultaneously with the X-ray tube becoming conductive.
  • the various resistances show present discharge of the condensers from imposing an inverse potential upon the secondary Winding i9 of transformer by autoemission through valve tube I2, and also prevent the pulsating D. C. source supplied through the valve tube I2 in the forward direction from being supplied to the X-ray tube as the voltage of the condensers falls to a low value. Since the cathode 'l is at gro-und potential, the triggering arrangement likewise is at the same potential, thus eliminating the necessity for an insulating transformer 23 as shown in Fig. 1.
  • the X-ray tube is at high potential during the discharge of condensers it and I?, but the triggering arrangement is at low voltage, except during the actual period of discharge of the high voltage condensers, enabling the various resistances 45 to protect the otherwise vulnerable parts of the circuit and thus eliminating the necessity for an insulating transformer, such as the transformer 28 of Fig. 1. Also, it will be noted that one end of the high voltage secondary winding I of transformer 8 is grounded and only one rectifying valve tube 2 is employed as previously mentioned in connection with the modication of Fig. 4.
  • the lamentary energizing condenser i3 is charged from the secondary winding 45 of a transformer 41 through a rectifying valve d3 and the resistances il-5, with the secondary winding being grounded at 49.
  • the primary winding S is connected to a suitable source of the customary commercial potential through an adjustable resistance 0r an autotransformer 52, for the purpose of Varying the charging potential of the condenser i8, as previously mentioned.
  • an X-ray apparatus for the making of short exposure radiographs is herein provided and in which the duration of the exposure ranges from .01 to .0001 second, thus utilizing a time range not heretofore possible to employ.
  • energy storage means such as a condenser
  • control of the discharge thereof being eiected by suddenly raising the X-ray tube cathode to an electron emitting temperature, thereby controlling the exposure time by the rate at which the X-ray tube cathode is heated and by its maximum temperature, thus regulating the time of discharging of the high voltage energizing condensers.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a lamentary oathode, a source of high potential electrical energy for energizing said Xray tube, means for applying a voltage to said iilamentary cathode to preheat the same to a temperature below that of electron emissivity, and means to suddenly energize said filamentary cathode by superimposing a higher voltage thereon to suddenly raise said iilamentary cathode to an electron emitting temperature to cause energization of said X-ray tube by said high potential source.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a filamentary cathode, a source of high potential electrical energy including energy storage means adapted to discharge its accumulated energy through said X-ray tube, means for applying a voltage to said lamentary cathode to preheat the same to a temperature below that of electron emissivity, and means to suddenly energize said lamentary cathode by superimposing a higher voltage thereon to suddenly raise said lamentary cathode to an electron emitting temperature to cause discharge of said energy storage means with attends ant energization of said X-ray tube.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a lamentary cathode, a source of high potential electrical energy including energy storage means adapted to discharge its accumulated energy through said X-ray tube, means for applying a Voltage to said lamentary cathode to preheat the same to a temperature below that of electron emissivity, and means to suddenly energize said lamentary cathode including energy storage means for momentarily superimposing a higher voltage on said nlamentary cathode to suddenly raise the latter to an electron emitting temperature to cause disT charge of said high voltage energy storage means with attendant energization of said X-ray tube.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a lamentary cathode, a source of high potential electrical energy including energy storage means adapted to discharge its accumulated energy through said X-ray tube, a source of energy connected to said lamentary cathode to preheat the same to a temperature below that of electron emissivities, a source of electrical energy adapted to be suddenly supplied to said iilamentary cathode including energy storage means for momentarily superimposing a higher Voltage on said iilamentary cathode to suddenly raise the latter to an electron emitting temperature with attendant discharge of said high potential energy storage means and energization of said X-ray tube, and means interposed between said filamentary cathode and said last mentioned energy storage means and operable at will to cause the latter to suddenly energize said filamentary cathode.
  • An X-ray apparatus for making short eX- posure radiographs comprising an X-ray tube provided with an anode and a lamentary cathode, a source of high potential electrical energy adapted to energize said X-ray tube for a predetermined period of time including energy storage means adapted to discharge its accumulated energy through said X-ray tube, a source of energy connected to said filamentary cathode to preheat the same to a temperature below that of electron emissivity, means for controlling the period of energization of said X-ray tube by said high potential source comprising a source of electrical energy adapted to be suddenly supplied to said filamentary cathode including a condenser of variable capacity and operable to momentarily superimposing a higher voltage on said filamentary cathode to suddenly raise the latter to an electron emitting temperature determinable by the capacity to which the condenser is previously adjusted to cause discharge of said high potential energy storage means and energization of said X-ray tube for
  • An X-ray apparatus for making short eX- posure radiographs comprising an X-ray tube provided with an anode and a lamentary cathode, a source of high potential electrical energy adapted to energize said X-ray tube for a predetermined period of time including energy storage means adapted to discharge its accumulated energy through said X-ray tube, a source of energy connected to said filamentary cathode to preheat the same to a temperature below that of electron emissivity, means for controlling the period of energization of said X-ray tube by said high potential source comprising a source of electrical energy adapted to be suddenly supplied to said lamentary cathode including energy storage means for momentarily superimposing a higher Voltage on said lamentary cathode to suddenly raise the latter to an electron emitting temperature with attendant discharge of said high potential energy storage means and energization of said X-ray tube for a period of time dependent upon the rapidity with which the temperature of said lilamentary cathode
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a filamentary cathode, a source of high potential electrical energy for energizing said X-ray tube including a high voltage transformer and energy storage means chargeable by said transformer in electrical parallel with each other and adapted to discharge in series through said X-ray tube to supply the latter with a voltage higher than that available from the transformer, a source of energy connected to said lamentary cathode to preheatthe same to a temperature below that of electron emissivity, a source of electrical energy adapted to be suddenly supplied to said lamentary cathode including energy storage means for momentarily superimposing a higher voltage on said filamentary cathode to suddenly raise the latter to an electron emitting temperature with attendant discharge of said high voltage energy storage means and energization of said X-ray tube, and means operable at will ⁇ to cause the sudden discharge of said last mentioned energy storage means through said X-ray tube.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a filamentary cathode, a source of high potential electrical energy for energizing said.
  • X-ray tube including a high voltage transformer and a plurality of condensers chargeable by said transformer in electrical parallel with each other and adapted to discharge in series through said X-ray tube to supply the latter with a voltage higher than that available from the transformer, at least one less spark-gap than the total number of condensers and included in the series discharge circuit of the latter, means for applying a voltage to said lamentary cathode to preheat the same to a temperature below that of electron emissivity, and means operable at will to cause the sudden heating of said cathode to electron emissivity and the discharge of said condensers through said X-ray tube with attendant energization of the latter.
  • An X-ray apparatus for making short exposure radiographs comprising an X-ray tube provided with an anode and a lamentary cathnde,A a source of high potential electrical energy for energizing said X-ray tube including a high voltage transformer and a plurality of condensers chargeable by said transformer in electrical parallel with each other and adapted to discharge in series through said X-ray tube to supply the latter with a voltage higher than that available from said transformer, a ground connection for said transformer, said condensers and said lamentary cathode, to reduce the insulation requirements of said apparatus, means for applying a voltage to said lamentary cathode to preheat the same to a temperature below that of electron emissivity, and means having a portion thereof at ground potential and operable at will to cause the sudden heating of said cathode to electron emissivity and the discharge of said condensers through said X-ray tube with attendant energization thereof.

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US540383A 1944-06-15 1944-06-15 Short exposure x-ray apparatus Expired - Lifetime US2420845A (en)

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Application Number Priority Date Filing Date Title
US540383A US2420845A (en) 1944-06-15 1944-06-15 Short exposure x-ray apparatus
GB14790/45A GB599273A (en) 1944-06-15 1945-06-11 Improvements in or relating to x-ray apparatus
FR947227D FR947227A (fr) 1944-06-15 1947-05-27 Appareil à rayons chi pour courtes expositions

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US540383A US2420845A (en) 1944-06-15 1944-06-15 Short exposure x-ray apparatus

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FR (1) FR947227A (fr)
GB (1) GB599273A (fr)

Cited By (14)

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US2498640A (en) * 1948-08-07 1950-02-28 Robert C Beck Photographic flash lighting apparatus
US2524240A (en) * 1947-09-26 1950-10-03 Ernest W Titterton High-voltage generator circuits
US3130312A (en) * 1961-07-26 1964-04-21 Profexray Inc X-ray timer system to produce short duration radiation pulses
US4208584A (en) * 1977-04-30 1980-06-17 U.S. Philips Corporation Circuit arrangement for an X-ray generator
US20060280286A1 (en) * 2005-04-15 2006-12-14 Brian Kaval X-ray imaging system having improved weather resistance
CN1998271B (zh) * 2002-11-21 2011-02-02 霍伊夫特系统技术有限公司 生成短时x射线脉冲的x射线单元以及使用该x射线单元的检验装置
US8837670B2 (en) 2006-05-05 2014-09-16 Rapiscan Systems, Inc. Cargo inspection system
US9052403B2 (en) 2002-07-23 2015-06-09 Rapiscan Systems, Inc. Compact mobile cargo scanning system
US9218933B2 (en) 2011-06-09 2015-12-22 Rapidscan Systems, Inc. Low-dose radiographic imaging system
US9224573B2 (en) 2011-06-09 2015-12-29 Rapiscan Systems, Inc. System and method for X-ray source weight reduction
US9223049B2 (en) 2002-07-23 2015-12-29 Rapiscan Systems, Inc. Cargo scanning system with boom structure
US9285498B2 (en) 2003-06-20 2016-03-15 Rapiscan Systems, Inc. Relocatable X-ray imaging system and method for inspecting commercial vehicles and cargo containers
US9332624B2 (en) 2008-05-20 2016-05-03 Rapiscan Systems, Inc. Gantry scanner systems
US9791590B2 (en) 2013-01-31 2017-10-17 Rapiscan Systems, Inc. Portable security inspection system

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US2227353A (en) * 1938-01-27 1940-12-31 Hartford Nat Bank & Trust Co Voltage regulation
US2240037A (en) * 1938-10-08 1941-04-29 X Ray Flash Lamp Corp Method and apparatus for producing x-ray flashes

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US2161985A (en) * 1934-03-12 1939-06-13 Szilard Leo Process of producing radio-active elements
US2227353A (en) * 1938-01-27 1940-12-31 Hartford Nat Bank & Trust Co Voltage regulation
US2240037A (en) * 1938-10-08 1941-04-29 X Ray Flash Lamp Corp Method and apparatus for producing x-ray flashes

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524240A (en) * 1947-09-26 1950-10-03 Ernest W Titterton High-voltage generator circuits
US2498640A (en) * 1948-08-07 1950-02-28 Robert C Beck Photographic flash lighting apparatus
US3130312A (en) * 1961-07-26 1964-04-21 Profexray Inc X-ray timer system to produce short duration radiation pulses
US4208584A (en) * 1977-04-30 1980-06-17 U.S. Philips Corporation Circuit arrangement for an X-ray generator
US9052403B2 (en) 2002-07-23 2015-06-09 Rapiscan Systems, Inc. Compact mobile cargo scanning system
US10670769B2 (en) 2002-07-23 2020-06-02 Rapiscan Systems, Inc. Compact mobile cargo scanning system
US10007019B2 (en) 2002-07-23 2018-06-26 Rapiscan Systems, Inc. Compact mobile cargo scanning system
US9223049B2 (en) 2002-07-23 2015-12-29 Rapiscan Systems, Inc. Cargo scanning system with boom structure
CN1998271B (zh) * 2002-11-21 2011-02-02 霍伊夫特系统技术有限公司 生成短时x射线脉冲的x射线单元以及使用该x射线单元的检验装置
US9285498B2 (en) 2003-06-20 2016-03-15 Rapiscan Systems, Inc. Relocatable X-ray imaging system and method for inspecting commercial vehicles and cargo containers
US7471764B2 (en) * 2005-04-15 2008-12-30 Rapiscan Security Products, Inc. X-ray imaging system having improved weather resistance
US8054938B2 (en) 2005-04-15 2011-11-08 Rapiscan Systems, Inc. X-ray imaging system having improved weather resistance
US20060280286A1 (en) * 2005-04-15 2006-12-14 Brian Kaval X-ray imaging system having improved weather resistance
US8750452B2 (en) 2005-04-15 2014-06-10 Rapiscan Systems, Inc. X-ray imaging system having improved weather resistance
US7783005B2 (en) 2005-04-15 2010-08-24 Rapiscan Systems, Inc. X-ray imaging system having improved weather resistance
US9223050B2 (en) 2005-04-15 2015-12-29 Rapiscan Systems, Inc. X-ray imaging system having improved mobility
US20090141863A1 (en) * 2005-04-15 2009-06-04 Brian Kaval X-Ray Imaging System Having Improved Weather Resistance
US8837670B2 (en) 2006-05-05 2014-09-16 Rapiscan Systems, Inc. Cargo inspection system
US9279901B2 (en) 2006-05-05 2016-03-08 Rapiscan Systems, Inc. Cargo inspection system
US10098214B2 (en) 2008-05-20 2018-10-09 Rapiscan Systems, Inc. Detector support structures for gantry scanner systems
US9332624B2 (en) 2008-05-20 2016-05-03 Rapiscan Systems, Inc. Gantry scanner systems
US9224573B2 (en) 2011-06-09 2015-12-29 Rapiscan Systems, Inc. System and method for X-ray source weight reduction
US9218933B2 (en) 2011-06-09 2015-12-22 Rapidscan Systems, Inc. Low-dose radiographic imaging system
US9791590B2 (en) 2013-01-31 2017-10-17 Rapiscan Systems, Inc. Portable security inspection system
US10317566B2 (en) 2013-01-31 2019-06-11 Rapiscan Systems, Inc. Portable security inspection system
US11550077B2 (en) 2013-01-31 2023-01-10 Rapiscan Systems, Inc. Portable vehicle inspection portal with accompanying workstation

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Publication number Publication date
GB599273A (en) 1948-03-09
FR947227A (fr) 1949-06-27

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