Quality Control of Gamma Camera with SPECT Systems

Abstract

Quality control of Gamma Camera with SPECT System is highly valuable for assurance performance characteristic. We report the performance characteristic of gamma camera by intrinsic calibration and verification measurement. The study has been done using the data from Siemens Symbia S Series gamma camera by using a point source 99m Tc at the Institute of Nuclear Medicine & Allied Sciences (INMAS), Khulna, Bangladesh. From intrinsic calibration and verification flood series, the integral uniformity for the central field of view (CFOV) has been found in between 4.01% and 2.88% and for the useful field of view (UFOV) has been in between 4.77% and 4.30%. The differential uniformity for the CFOV has been in between 1.53% and 2.04% and for the UFOV has been in between 2.32% and 2.77%. According to Operating Instruction Symbia System S Series manual, uniformity can compensate for values exceeding 10%, however while integral uniformity exceed 7%, have to contract Siemens customer service representative. In conclusion, these results show that the intrinsic uniformity of the gamma camera under this condition is within an acceptable range; thus the gamma camera working in INMAS is performed well.

Pengaruh Penurunan Aktivitas Cobalt-57 Terhadap QC (Quality Control) Harian SPECT (Single Photon Emission Computed Tomography) di Instalasi Kedokteran Nuklir RSUD A. W Sjahranie Samarinda

“…Ini digunakan untuk studi klinis yang menghasilkan citra yang lebih baik dan membuat diagnosis lebih mudah. Sistem SPECT lebih sensitif daripada kamera gamma biasa, sehingga memerlukan dukungan teknis khusus [2].…”

“…Kamera gamma terdiri dari banyak bagian, masing-masing bagian melakukan fungsi khusus dalam mengubah sinar gamma menjadi citra cahaya dan akhirnya didapatkan citra tampilan yang sesuai. Komponen dasar kamera gamma adalah kolimator, Kristal NaI (natrium iodide), tabung PMT photomultiplier), dan rangkaian logika posisi yang dapat dilihat pada Gambar 1 [2].…”

“…Exstrinsic flood uniformity adalah bagian dari program QC departemen Kedokteran Nuklir yang memastikan standar efisiensi dan penggunaan yang tinggi dalam penggunaan kamera gamma. Dengan demikian, kegiatan ini dilakukan untuk menghindari perubahan kinerja sistem kamera gamma yang mungkin mempengaruhi interpretasi hasil pemeriksaan kamera gamma [2].…”

Development and Application of Gamma Camera in the Field of Nuclear Medicine

“…In addition to being a separate mobile imaging system, small gamma cameras can also be combined with other specialized imaging systems. Single photon emission computed tomography (SPECT) and positron emission tomography (PET) are also developed on the basis of gamma camera [1].The main function of a gamma camera with SPECT system is to scan the brain, heart, breath, liver and kidney. The SPECT system is more sensitive than the ordinary gamma camera, but the cost of purchase and maintenance is relatively high [1].Therefore, small volume portable gamma cameras will have high research value in the future.…”