公开(公告)号：US3767850A

公开(公告)日：1973-10-23

申请号：US3767850D

申请日：1972-02-22

Applicant: ABBOTT LAB

Inventor： MC MILLIAN L ,  HUTCHISON A ,  GARD L

IPC: G01T1/166 ,  G01T1/20 ,  H04N5/84

CPC classification number: G01T1/166 ,  G01T1/1663

Abstract: The disclosure describes apparatus for preventing scalloping the photographic film image produced by a scintillation scanner. The described scanner comprises a detector which can be scanned along parallel paths over an area of interest in a patient. The detector is directly coupled to a light-emitting tube that simultaneously is scanned in a similar manner over a photographic film. Gamma rays emitted by the patient are received by the detector and are converted into corresponding electrical event pulses and bits of event information which are sequentially shifted through shift registers in response to periodic clock pulses. A stepping motor moves the detector and light-producing tube a predetermined distance in response to the receipt of each clock pulse so that the concentration of gamma ray events occuring along any particular segment of the detector scan path can be precisely determined. An individual event pulse is transmitted to the light-producing tube after is has been shifted halfway through the shift register, so that the information stored in the shift register represents gamma ray events occurring before and after the gamma ray event resulting in the event pulse. A counter continuously analyzes the information flowing into and out of the shift register so that an accurate count of the information bits stored in the shift register is continuously available. Additional means are provided for controlling the intensity of the light produced by the tube in response to the value of the information stored in the shift register. As a result, the light intensity produced in response to any single gamma ray event depends on the concentration of gamma ray events occurring on either side of the single event along the detector scan path.

Abstract translation: 本公开描述了用于防止扇形闪烁扫描仪产生的摄影胶片图像的装置。 所描述的扫描器包括可以沿着平行路径扫描患者感兴趣区域的检测器。 检测器直接耦合到发光管，同时在照相胶片上以类似的方式扫描。 由患者发射的γ射线由检测器接收，并被转换成对应的电事件脉冲和事件信息的位，响应于周期性时钟脉冲而顺序地移位移位寄存器。 响应于每个时钟脉冲的接收，步进电机将检测器和发光管移动预定距离，使得可以精确地确定沿检测器扫描路径的任何特定段发生的伽马射线事件的浓度。 在通过移位寄存器移动中途之后，单个事件脉冲被传送到发光管，使得存储在移位寄存器中的信息表示在导致事件脉冲的伽马射线事件之前和之后发生的伽马射线事件。 计数器连续分析流入和移出移位寄存器的信息，从而可以连续地获得存储在移位寄存器中的信息位的精确计数。 提供附加装置，用于响应于存储在移位寄存器中的信息的值来控制由管产生的光的强度。 结果，响应于任何单个伽马射线事件产生的光强度取决于沿着检测器扫描路径的单个事件的任一侧上发生的伽马射线事件的浓度。

公开(公告)号：US3857065A

公开(公告)日：1974-12-24

申请号：US22817472

申请日：1972-02-22

Applicant: ABBOTT LAB

Inventor： HUTCHISON A ,  MCMILLIAN L

IPC: G01T1/166 ,  H05B37/00

CPC classification number: G01T1/166 ,  Y10S315/05

Abstract: The disclosure describes an apparatus and a method for maintaining the light intensity produced by a gas-filled tube at a predetermined value for a predetermined time period. The apparatus preferably comprises a control means, such as a transistor current sink, connected in series with the tube for applying a voltage across the tube at a predetermined time and for controlling the amount of current flowing through the tube in order to regulate the intensity of light produced thereby. A logic circuit is provided for generating a first operating signal at the time voltage is applied to the tube, and a resistive component in series with the current sink is provided for generating a second operating signal at the commencement of current conduction through the tube. A termination signal is generated by a monostable multivibrator within a predetermined time period after the commencement of current conduction through the tube. A generating means, preferably comprising a resistivecapacitive storage circuit that is charged by a current source, generates a first control signal linearly varying in a first direction in response to the first operating signal. The generation of the first control signal is terminated in response to the second operating signal, and thereafter the generating means generates a second control signal exponentially varying in a second direction. The control signals are transmitted to the control means so that the initial amount of current flowing through the tube is proportional to the length of time between the application of voltage across the tube and the commencement of current conduction through the tube. Thereafter, the current flow through the tube decreases in accordance with the second control signal so that the intensity of light produced by the tube remains constant until the termination signal is received. In response to the termination signal, the control means substantially prevents current flow through the tube in order to terminate light production.