[특허]Preventive maintenance system for the photomultiplier detector blocks of pet scanners

Preventive maintenance system for the photomultiplier detector blocks of pet scanners 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-015/20
출원번호	US-0934714 (1992-08-24)
발명자 / 주소	Levy Alejandro V. (Center Moriches NY) Warner Donald (Shirley NY)
출원인 / 주소	Associated Universities, Inc. (Washington DC 02)
인용정보	피인용 횟수 : 79 인용 특허 : 0

초록 ▼

A system including a method and apparatus for preventive maintenance of PET scanner photomultiplier detector blocks is disclosed. The quantitive 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 t0, a time t1 and a time T, where T>t1>t0, 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 perform 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.

대표청구항 ▼

A computer implemented method for the preventive maintenance of photomultiplier detector blocks of a PET scanner, to determine if a detector block is intermittently unstable, the method comprising the steps of: (a) calibrating a photomultiplier detector block i of a PET scanner by iteratively adjusting a gain by which photomultipliers in said photomultiplier detector block i amplify a detected signal, and storing a record of a number of iterative adjustments that are necessary at time t0 to calibrate the photomultiplier detector block i, wherein said record is designated as Histo(i),j(t)); (b) repeating step (a) for a time t1 and for a time T, where T>t1>t0; (c) computing an average of the number of iterative adjustments necessary to calibrate said detector block for said time t0 through said time T, wherein said average through said time T is stored as av(i); (d) computing a standard deviation of the number of iterative adjustments necessary to calibrate said detector block for said time t0 through said time T, wherein said standard deviation through said time T is stored as sd(i); (e) determining whether said photomultiplier detector block i is an intermittent unstable block with a peak at said time T, by computing at said time T if: Histo(i,j(T))>av(i)+2sd(i), wherein if it is determined that said detector block is an intermittent unstable block with a peak at said time T, said method further comprising: (1) storing said number of iterative adjustments required for said detector block i at said time T as npeak(i,jp)=T, wherein jp denotes the number of intermittent peaks detected for said photomultiplier detector block i from time t=t0 through t=T; (2) calculating a minimum time designated mintp, between peaks of said intermittent unstable block from said times t0 to said time T; and (3) providing an output signal to advise that photomultiplier detector block i is an intermittently unstable block and should be changed or serviced prior to a time=T+mintp when a new peak is likely to occur.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Preventive maintenance system for the photomultiplier detector blocks of pet scanners 원문보기

초록 ▼

대표청구항 ▼

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연합인증

Preventive maintenance system for the photomultiplier detector blocks of pet scanners 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

전체(0) 논문(0) 특허(0) 보고서(0)

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이 특허를 인용한 특허 (79)

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