中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

9 records (took 0.019 seconds)

    Scintillation camera
    1.
    发明授权
    Scintillation camera 失效
    闪烁相机

    公开(公告)号：US3904530A

    公开(公告)日：1975-09-09

    申请号：US28762372

    申请日：1972-09-11

    Applicant: PICKER CORP

    Inventor： MARTONE RONALD J ,  MUELLER PETER G ,  HINDEL ROBERT

    IPC: G01T1/164 ,  G01T1/20

    CPC classification number: G01T1/1642 ,  A61B6/4258

    Abstract: In a gamma ray imaging camera having a scintillation crystal and a plurality of phototubes, two channels are provided for receiving and processing radiation of two different energy levels arising from injection into a patient of two different radioisotopes. Signals in the two energy ranges may both be recorded for future analysis or may be displayed side-by-side on an oscilloscope. Regardless of whether one or two isotopes are used, information describing the locations of scintillation in the crystal may be digitized, recorded, and played back for visual display at a later time. Alternatively, the location information may be displayed immediately. Calibration means are also provided for presenting the output of each phototube individually on an oscilloscope so that the apparatus may be adjusted to correct for variations inherent in phototubes.

    Abstract translation: 在具有闪烁晶体和多个光管的伽马射线成像相机中，提供两个通道用于接收和处理从注射到两个不同放射性同位素的患者中的两种不同能级的辐射。 两个能量范围内的信号都可以记录下来进行分析，或者可以在示波器上并排显示。

    4.
    发明专利
    未知

    公开(公告)号：DE1930861A1

    公开(公告)日：1970-01-02

    申请号：DE1930861

    申请日：1969-06-18

    Applicant: PICKER CORP

    Inventor： HINDEL ROBERT

    IPC: G01T1/164 ,  G01T1/16

    Abstract: 1,262,759. Detecting position of radiation sources. PICKER CORP. 19 June, 1969 [25 June, 1968], No. 31135/69. Heading H4D. Specification describes an improvement in tomographic scintillation detectors of the type described in U.S. Specification 3,011,057. In said detector, the subject (e.g. a person) to be investigated, is injected with a radio-active substance and the distribution of the ensuing radio-activity is detected by means of a scintillation crystal producing correspondingly distributed light flashes, and an array of phototubes 10, Fig. 1, viewing the crystal and giving outputs indicative of the X and Y co-ordinates of the flashes and, by means of a scanning device, outputs indicative of the intensity Z of the flashes. These co-ordinate signals are fed to a cathode-ray tube to give spots on the screen thereof indicative of the positions of the light flashes and thus of said radio-active distribution. In said detectors however, the X and Y coordinated signals are dependent on the intensity Z of the flash whereby two consecutive flashes at the same positions on the crystal but of different brightness, will give two differently positioned spots on the C.R.T. screen. To overcome this fault the present Specification advocates the feeding of the X and Y signals and the Z intensity (sum) signal to respective storage and decay circuits 30, 32 and 34, whereby the signals start simultaneously to decay and are then stopped when the Z signal has decayed to a reference level (as determined by comparison circuit 36) representing a standard intensity, the levels of the X and Y signals so reached being independent of the intensity of the light flash and giving correctly positioned spots on the C.R.T.12. The Z signal decay circuit 34 and comparison circuit 36 are shown in detail in Fig. 2. The start of the Z signal 162, Fig. 3, at time t 1 triggers, in monostable circuits 26 negative going and positive going pulses 94 and 140, Fig. 2, ending at time t 3 , and in monostable circuit 28, a positive going pulse 130 ending at time t 5 . A Darlington long tailed pair circuit 42 compares the amplitude of the Z signal 162 with the voltage across capacitor 40, such that from time t 1 to t 2 the collector potential of conducting transistor 54 is low and switches on transistor 74. Transistor 76 is switched on by pulse 94 such that a charging current flows to capacitor 40 via resistor 88, transistors 76, 74, diodes 82, 70 and resistor 68. Capacitor 40 thus charges up to the peak of signal 162 and then holds this charge until time t 3 . At time t 3 , transistor 134, in comparator 36, previously held conducting by pulse 140, becomes non-conducting, this raises the base potential of transistor 94 whereby said transistor starts to conduct and slowly discharges capacitor 40. The potential V z on capacitor 40 is fed to one input of a voltage comparison logic block 136, via buffer transistors 112, 114, the other input of the block being fed with the reference voltage V R from potentiometer 144. When V z drops to V R , block 136 reduces its output voltage and shuts off transistor 94, whereby the capacitor's potential stores at the reference level. The output of the block 136 is fed to the X and Y delay circuits (similar to Fig. 2) to cause a similar storage of the potential reached by their capacitors and the subsequent application of said stored potential to the C.R.T. via outputs such as 124. The capacitor 40 continues to store, until time t 5 , when transistor 96 is rendered conductive by means of the end of pulse 130, and provides a rapid discharge path to ground.

Patent Agency Ranking