TY - JOUR
T1 - Development of a DSP-based real-time position calculation circuit for a beta camera
AU - Yamamoto, Seiichi
AU - Matsuda, Tadashige
AU - Kanno, Iwao
N1 - Funding Information:
This work was partly supported by the Japan Science and Technology Corporation.
PY - 2000/3/1
Y1 - 2000/3/1
N2 - A digital signal processor (DSP)-based position calculation circuit was developed and tested for a beta camera. The previous position calculation circuit which employed flash analog-to-digital (A-D) converters for A-D conversion and ratio calculation produced 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 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) on an 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 were almost eliminated.
AB - A digital signal processor (DSP)-based position calculation circuit was developed and tested for a beta camera. The previous position calculation circuit which employed flash analog-to-digital (A-D) converters for A-D conversion and ratio calculation produced 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 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) on an 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 were almost eliminated.
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U2 - 10.1016/S0168-9002(99)00977-8
DO - 10.1016/S0168-9002(99)00977-8
M3 - Article
AN - SCOPUS:0033889026
SN - 0168-9002
VL - 441
SP - 359
EP - 365
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 3
ER -