JPS59222133A - Ct scanner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a CT scanner in a CT apparatus, and more particularly to a CT scanner equipped with a slip ring having a rail and a brush that slides on the rail.

[Technical background of the invention and its problems]

Conventionally, CT scanners, such as XNCT scanners,
Some scanners have a donut-shaped slip ring assembly with an inner diameter large enough to allow insertion of a subject into the scanner body. The slip ring assembly allows continuous rotation of the X-ray tube within the scanner body;
As shown in FIG. 1, a donut plate has the same center as a circular specimen insertion hole (not shown) in the scanner body and has an inner diameter larger than the diameter of the specimen insertion hole. The rail 1 includes a shaped rail 1 and a brush portion having a brush 3 that slides on a plate-like surface 2 of the rail 1. For example, the rail 1 is electrically connected to an XII tube (not shown),
Further, the brush 3 is electrically connected to a high voltage generator (not shown).

Since the brush 3 is relatively movable on the plate-like surface 2 of the rail 1, a high voltage supplied from a high voltage generator is applied to the X#li held on the rail 1. ! The tube can be continuously rotated around the subject insertion hole.

However, since the brush 3 is provided on the circumference having a constant radius R from the center of the subject insertion hole,
Sliding marks are formed on the plate-like surface 2 of the rail 1, resulting in poor contact between the rail 1 and the brush 3. and,
It becomes necessary to replace the rail 1 or the brush 3 within a short period of time.

[Purpose of the invention]

This invention was made in consideration of the above-mentioned circumstances, and by preventing the formation of sliding marks caused by brushes on the rails of slip rings, it is possible to prolong the life of the rails and to prevent them from being damaged after maintenance and inspection. An object of the present invention is to provide a CT scanner that can prolong the time required for maintenance and inspection during transmission.

[Summary of the invention]

The outline of the present invention for achieving the above object is to hold a brush electrically connected to a high voltage generator and an X-ray tube, electrically connected to the X-ray tube, and larger than the subject insertion hole. A slip ring having an annular rail having an inner diameter, and brush driving means for vibratingly driving the brush along the radial direction of the rail, and expanding the contact locus of the brush on the rail surface. What are the characteristics?

[Embodiments of the invention]

An embodiment of the invention will be described with reference to the drawings.

FIG. 2 is an explanatory diagram showing one embodiment of the present invention, and FIG. 3 is a schematic sectional view showing an example of the structure of a slip ring and a brush in the embodiment.

As shown in FIG. 2, a CT scanner according to an embodiment of the present invention, for example, an Xl1l CT scanner, has a slip ring 4 and a brush drive means 5.

The slip ring 4 has a donut plate-shaped rail 6 which has the same center 0 as a circular specimen insertion hole (not shown) in the Xl1CT scanner and has an inner diameter r larger than the diameter of the specimen insertion hole; As shown in Figure 3,
A plurality of brushes 7 that can come into contact with the donut plate-shaped surface of the rail 6
It has a brush part 9 which can be held on the support member 8. The rail 6 holds an XrA tube (not shown), is electrically connected to the rail 6, and is configured to rotate around a subject insertion hole (not shown) by a slip ring rotation drive section 10. Further, the brush portion 9 is electrically connected to a high voltage generator (not shown). Therefore, a high voltage is applied to the X1ffA tube (not shown) by the high voltage generator via the slip ring 4, and it can rotate around the subject insertion hole according to the rotation of the rail 6.

The brush unit driving means 5 includes a detector 11 that detects the rotation of the knob 6, and a trajectory of the brush 7 formed on the donut plate-shaped surface of the rail 6 every time the rail 6 rotates as detected by the detector 11. The drive unit 12 is configured to have a drive unit 12 that drives the brush unit 9 in a reciprocating manner along the radial direction of the inner diameter (or outer diameter) of the rail 6 so that the brush unit 9 is different.

In the XIII ICT scanner configured as described above, after the subject is placed in the subject insertion hole (not shown), the rail 6 is rotated around 0 by the slip ring rotation drive unit 10, so that the xm tube around the subject is rotated. will rotate. Then, by applying a high voltage to the X-ray tube in a pulsed manner from a high voltage generator (not shown), XwA is intermittently emitted from the X-ray tube rotating around the subject. On the other hand, the rotation of the rail 6 is detected by the detector 11 in the brush part driving means 5, and the brush 7 is formed on the donut plate-shaped surface of the rail 6 by the driving part 12.
The brush portion 9 is reciprocated in the radial direction of the rail 6 so that the locus thereof differs each time the rail 6 rotates. Therefore, since the locus of the brush 7 differs each time the rail 6 rotates, specific sliding marks are no longer formed on the donut plate-shaped surface of the rail 6, and the life of the slip ring 4 can be extended. I can do it.

Although one embodiment of this invention has been described in detail above, this invention is not limited to the above embodiment, and it goes without saying that it can be implemented with appropriate modifications within the scope of the gist of this invention. Nor.

In place of the brush unit driving means 5 in the above embodiment, a second embodiment includes a detector that counts the cumulative number of revolutions of the rail 6 and outputs a detection signal when a predetermined number of revolutions is reached, and the detector. The drive section does not move the brush section 9 in the radial direction of the rail 6 until a detection signal is input, but moves the brush section 9 slightly along the radial direction of the rail 6 in response to the detection signal. A brush portion driving means having a brush portion driving means may be provided.

Furthermore, the configuration shown in FIG. 4 can be cited as a third embodiment.

The brush portion driving means 5 shown in FIG. 4 includes a deceleration mechanism 13 that decelerates the rotational motion output from the slip ring rotation drive portion 10, and a cam reciprocating mechanism or a link reciprocating mechanism to reduce the rotational motion output from the deceleration mechanism 13. The drive unit 14 converts the movement into a reciprocating motion and enables the brush portion 9 to reciprocate so that the locus of the brush 7 differs each time the rail 6 rotates.

〔Effect of the invention〕

According to this invention, the contact locus of the brush sliding on the donut plate-shaped surface of the rail spreads over the entire range on the donut plate-shaped surface, so that specific sliding streaks can be This prevents the formation of the slip ring and prevents uneven wear of the rail, thereby extending the life of the slip ring and extending the periodic inspection period of the CT scanner.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional slip ring, FIG. 2 is an explanatory diagram showing an embodiment of the present invention, FIG. FIG. 4 is an explanatory diagram showing an embodiment of the present invention. 3...Brush, 4...Slip ring, 5...Brush portion driving means, 6...
...Rail, 9...Brush part.

Claims (1)

[Claims] a slip ring having a brush that is electrically connected to the high voltage generator; and an annular rail that holds the X-ray tube and is electrically connected to the XII tube and has an inner diameter larger than the specimen insertion hole; A CT scanner comprising brush driving means for slidably driving the brush along the radial direction of the rail, and the contact locus of the brush on the rail surface is enlarged.