TY - GEN
T1 - DSP based real-time position calculation circuit for beta camera
AU - Yamamoto, S.
AU - Matsuda, T.
AU - Kanno, I.
PY - 1999
Y1 - 1999
N2 - A digital signal processor(DSP) based position calculation circuit was developed and tested for beta camera. The previous position calculation circuit which 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.
AB - A digital signal processor(DSP) based position calculation circuit was developed and tested for beta camera. The previous position calculation circuit which 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.
UR - http://www.scopus.com/inward/record.url?scp=0032596998&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032596998&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0032596998
SN - 0780350227
T3 - IEEE Nuclear Science Symposium and Medical Imaging Conference
SP - 1509
EP - 1512
BT - IEEE Nuclear Science Symposium and Medical Imaging Conference
PB - IEEE
T2 - Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record
Y2 - 8 November 1998 through 14 November 1998
ER -