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Title: Preventive maintenance system for the photomultiplier detector blocks of PET scanners

A system including a method and apparatus for preventive maintenance of PET scanner photomultiplier detector blocks is disclosed. The qualitative comparisons used in the method of the present invention to provide an indication in the form of a display or printout advising the user that the photomultiplier block is stable, intermittently unstable, or drifting unstable, and also advising of the expected date of failure of a photomultiplier block in the PET scanner. The system alerts the user to replace the defective photomultiplier block prior to catastrophic failure in a scheduled preventative maintenance program, thus eliminating expensive and unscheduled downtime of the PET scanner due to photomultiplier failure. The apparatus for carrying out the method of the present invention preferably resides in the host computer controlling a PET scanner. It includes a memory adapted for storing a record of a number of iterative adjustments that are necessary to calibrate the gain of a photomultiplier detector block i at a time t[sub 0], a time t[sub 1] and a time T, where T>t[sub 1]>t[sub 0], which is designated as Histo(i,j(t)). The apparatus also includes a processor configured by a software program or a combination of programmed RAM and ROM devices to performmore » a number of calculations and operations on these values, and also includes a counter for analyzing each photomultiplier detector block i=1 through I of a PET scanner. 40 figures.« less
Inventors:
;
Issue Date:
OSTI Identifier:
6649263
Assignee:
Associated Universities, Inc., Washington, DC (United States) PTO; EDB-95-031452
Patent Number(s):
US 5384699; A
Application Number:
PPN: US 7-934714
Contract Number:
AC02-76CH00016
Resource Relation:
Patent File Date: 24 Aug 1992
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; PHOTOMULTIPLIERS; MAINTENANCE; POSITRON COMPUTED TOMOGRAPHY; RADIOISOTOPE SCANNERS; CALIBRATION; COMPUTERIZED CONTROL SYSTEMS; COMPUTERIZED TOMOGRAPHY; CONTROL SYSTEMS; DIAGNOSTIC TECHNIQUES; EMISSION COMPUTED TOMOGRAPHY; ON-LINE CONTROL SYSTEMS; ON-LINE SYSTEMS; PHOTOTUBES; TOMOGRAPHY 550601* -- Medicine-- Unsealed Radionuclides in Diagnostics

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