A DSP based real-time position calculation circuit for beta camera

Author

Yamamoto, S. ; Matsuda, T. ; Kanno, I.

Author_Institution

Kobe City Coll. of Technol., Japan

Volume

3

fYear

1998

fDate

1998

Firstpage

1509

Abstract

A digital signal processor (DSP) based position calculation circuit was developed and tested for beta camera. The previous position calculation circuit employed flash analog to digital (A-D) converters for A-D conversion and ratio calculation occurred significant line artifacts in the image due to the differential non-linearity of the A-D converters. The new position calculation circuit uses four A-D converters for only A-D conversion of the analog signals from the position sensitive photomultiplier tube (PSPMT). The DSP reads the A-D signals and calculates the ratio of Xa/(Xa+Xb) and Ya/(Ya+Yb) in event by event basis. The DSP also magnifies the image to fit the useful field of view (FOV) and rejects the events out of the FOV. The line artifacts in the image was almost eliminated

Keywords

analogue-digital conversion; beta-ray detection; biomedical electronics; cameras; medical image processing; photomultipliers; radioisotope imaging; DSP based real-time position calculation circuit; beta camera; differential nonlinearity; digital signal processor; event by event basis; flash analog to digital converters; image line artifacts elimination; medical diagnostic imaging; nuclear medicine; position sensitive photomultiplier tube; ratio calculation; Analog-digital conversion; Cameras; Circuit testing; Digital signal processing; Floods; Image converters; Optical imaging; Positron emission tomography; Timing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE

Conference_Location

Toronto, Ont.

ISSN

1082-3654

Print_ISBN

0-7803-5021-9

Type

conf

DOI

10.1109/NSSMIC.1998.773830

Filename

773830