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Method for dead time determination in a gamma camera and system for implementing the method

A gamma camera, space technology, used in radiation measurement, instruments, measurement devices, etc., can solve complex problems

Active Publication Date: 2019-09-17
SIEMENS MEDICAL SOLUTIONS USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Therefore, it would be desirable to provide a new and improved method and apparatus for compensating for dead time of gamma cameras that is less complex and more likely to produce accurate results than previously used techniques

Method used

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  • Method for dead time determination in a gamma camera and system for implementing the method
  • Method for dead time determination in a gamma camera and system for implementing the method
  • Method for dead time determination in a gamma camera and system for implementing the method

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Embodiment Construction

[0017] Disclosed herein is a method for estimating the dead time of a nuclear imaging system by injecting into the data stream pulse events similar in amplitude and shape to pulses produced by the system in response to the interaction of stimuli from a radiation field (also referred to as systems and methods for counting losses). The injected pulses may be introduced in analog format via an analog pulser prior to analog-to-digital conversion of the pulses, or alternatively may be introduced digitally downstream of the analog-to-digital converter via a digital pulser in electrical communication with the system. The injected pulses are counted using one or more windows (spatial window and / or energy window) to determine system count loss. These injected pulses are composite pulses and are introduced via a pulser. They are also sometimes called spurious pulses. In an embodiment, both analog and digital pulses may be injected simultaneously or sequentially into the data stream fr...

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Abstract

A method for estimating count loss in a gamma camera is disclosed herein, the method comprising: injecting synthetic pulses at a given rate into a data stream from a photodetector; integrating the synthetic pulses into the data stream to form Integrating the data stream; determining the number of synthesized pulses from the data stream delivered into the final image; and determining the count loss from equation (2).

Description

[0001] Cross References to Related Applications [0002] This disclosure claims the benefit of U.S. Provisional Patent No. 62 / 130,677, filed March 10, 2015, and U.S. Provisional Patent No. 62 / 015,567, filed June 23, 2014, the entire contents of both applications are incorporated by reference here. Background technique [0003] The present disclosure relates to a method for determining dead time in a gamma camera and a system for implementing the method. [0004] The dead time (also known as count loss) of a nuclear imaging system is the time during which the system processes one or more events (i.e., the interaction of particles or stimuli from the radiation field with the system) and cannot Used to handle subsequent events. This arises due to the large number of electronic circuits (each with its own dead time) in nuclear imaging systems and the complex interactions between such circuits. In addition, the count rate loss of the system is a function of the total number of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/17
CPCG01T1/171G01T1/20G01T1/17G01T1/208
Inventor R.E.马尔明J.F.卡鲁巴
Owner SIEMENS MEDICAL SOLUTIONS USA INC