JPS561500A - Phototimer for taking x-ray picture - Google Patents
Phototimer for taking x-ray pictureInfo
- Publication number
- JPS561500A JPS561500A JP7887079A JP7887079A JPS561500A JP S561500 A JPS561500 A JP S561500A JP 7887079 A JP7887079 A JP 7887079A JP 7887079 A JP7887079 A JP 7887079A JP S561500 A JPS561500 A JP S561500A
- Authority
- JP
- Japan
- Prior art keywords
- dark current
- input
- voltage
- taking
- ray picture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/38—Exposure time
- H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
- H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- X-Ray Techniques (AREA)
Abstract
PURPOSE:To exactly rectify a dark current by detecting the dark current before the initiation of a photographing, memorizing a voltage required to cancel the dark current, and rectifying the dark current upon taking an X-ray picture by a dark current value right before taking the X-ray picture. CONSTITUTION:Prior to taking an X-ray picture, the dark current from a photomultiplier tube 1 is converted to a voltage by a current-voltage convertor 11 and then input into an amplifier 6 of an integration circuit 2. The output voltage of the circuit 2 is input into a zero voltage comparator 13 and thereafter either one of the L and H signals is output depending on whether the input voltage is positive or negative. This L or H signal is applied as a branch signal to one of the gates of a 2-gate circuit 15, whereby a counter 16 counts the clock pulse from a clock pulse generator 14. A digital signal from the counter 16 is input into an adder 12 via a D/A convertor 17, whereby cancelling an input derived from a dark current at the time of photographing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7887079A JPS6024560B2 (en) | 1979-06-19 | 1979-06-19 | Phototimer for X-ray photography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7887079A JPS6024560B2 (en) | 1979-06-19 | 1979-06-19 | Phototimer for X-ray photography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS561500A true JPS561500A (en) | 1981-01-09 |
| JPS6024560B2 JPS6024560B2 (en) | 1985-06-13 |
Family
ID=13673852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7887079A Expired JPS6024560B2 (en) | 1979-06-19 | 1979-06-19 | Phototimer for X-ray photography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6024560B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57202699A (en) * | 1981-06-08 | 1982-12-11 | Hitachi Medical Corp | Device for automatic exposure to x-rays |
-
1979
- 1979-06-19 JP JP7887079A patent/JPS6024560B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57202699A (en) * | 1981-06-08 | 1982-12-11 | Hitachi Medical Corp | Device for automatic exposure to x-rays |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6024560B2 (en) | 1985-06-13 |
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