Design of a 2-D coded aperture imaging system using 32 gamma ray 1-D array detectors

This paper proposes a step towards a practical use of a hybrid type gamma camera for medical diagnoses of breast cancer. The camera is composed of an integrated combination of ultrasound imaging device and 2-D CA (coded aperture) imaging system with cesium iodide crystal with multianode photomultiplier tube gamma ray 1-D array detectors. It is designed to yield fusion images with radioisotopes and ultrasound, which will come in handy for cancer diagnoses. To reduce the cost and the size of the camera, it is desirable that the number of detectors is not more than 32. Under this condition, we found by numerical simulations that 3rd degree m-sequence is optimal for CA pattern.