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Morita, Keishin, Maebatake, Akira, Iwasaki, Rina, Shiotsuki, Yuki, Himuro, Kazuhiko, Baba, Shingo, Sasaki, Masayuki. (1397). Evaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators. , 6(2), 120-128. doi: 10.22038/aojnmb.2018.10330
Keishin Morita; Akira Maebatake; Rina Iwasaki; Yuki Shiotsuki; Kazuhiko Himuro; Shingo Baba; Masayuki Sasaki. "Evaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators". , 6, 2, 1397, 120-128. doi: 10.22038/aojnmb.2018.10330
Morita, Keishin, Maebatake, Akira, Iwasaki, Rina, Shiotsuki, Yuki, Himuro, Kazuhiko, Baba, Shingo, Sasaki, Masayuki. (1397). 'Evaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators', , 6(2), pp. 120-128. doi: 10.22038/aojnmb.2018.10330
Morita, Keishin, Maebatake, Akira, Iwasaki, Rina, Shiotsuki, Yuki, Himuro, Kazuhiko, Baba, Shingo, Sasaki, Masayuki. Evaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators. , 1397; 6(2): 120-128. doi: 10.22038/aojnmb.2018.10330

Evaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators

Asia Oceania Journal of Nuclear Medicine and Biology
مقاله 6، دوره 6، شماره 2، مهر 2018، صفحه 120-128    اصل مقاله (1.14 M)
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22038/aojnmb.2018.10330
نویسندگان
Keishin Morita1؛ Akira Maebatake1؛ Rina Iwasaki2؛ Yuki Shiotsuki2؛ Kazuhiko Himuro3؛ Shingo Baba4؛ Masayuki Sasaki* 1
1Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2Radiological Science Course, Department of Health Sciences, School of Medicine, Kyushu University, Fukuoka, Japan
3Division of Radiology, Department of Medical Technology, Kyushu University Hospital, Fukuoka, Japan
4Department of Clinical Radiology, Kyushu University Hospital, Fukuoka, Japan
چکیده
Objective(s): The purpose of this study was to examine the optimal reconstruction parameters for brain dopamine transporter SPECT images obtained with a fan beam collimator and compare the results with those obtained by using parallel-hole collimators.
Methods: Data acquisition was performed using two SPECT/CT devices, namely a Symbia T6 and an Infinia Hawkeye 4 (device A and B) equipped with fan-beam (camera A-1 and B-1), low- and medium-energy general-purpose (camera A-2 and B-2), and low-energy high-resolution (camera A-3 and B-3) collimators. The SPECT images were reconstructed using filtered back projection (FBP) with Chang’s
attenuation correction. However, the scatter correction was not performed. A pool phantom and a three-dimensional (3D) brain phantom were filled with 123I solution to examine the reconstruction parameters. The optimal attenuation coefficient was based on the visual assessment of the profile curve, coefficient of variation (CV) [%], and summed difference from the reference activity of the pool phantom. The optimal Butterworth filter for the 3D-brain phantom was also determined based on a visual assessment. The anthropomorphic striatal phantom was filled with 123I solution at striatum-to-background radioactivity ratios of 8, 6, 4, and 3. The specific binding ratio (SBR) of the striatum (calculated by the CT method) was used to compare the results with those of the parallel-hole collimators.
Results: The optimal attenuation coefficients were 0.09, 0.11, 0.05, 0.05, 0.11, and, 0.10 cm-1 for cameras A-1, A-2, A-3, B-1, B-2, and B-3, respectively. The cutoff frequencies of the Butterworth filter were 0.32, 0.40, and 0.36 cycles/cm for camera A, and 0.46, 0.44, and 0.44 cycles/cm for camera B, respectively. The recovery rates of the SBRmean with camera A were 51.2%, 49.4%, and 45.6%, respectively. The difference was not
statistically significant. The recovery rates of the SBR with camera B were 59.2%, 50.7%, and 50.8%, respectively. Camera B-1 showed significantly high SBR values.
Conclusion: As the findings indicated, the optimal reconstruction parameters differed according to the devices and collimators. The fan beam collimator was found to provide promising results with each device.
کلیدواژه‌ها
SPECT/CT؛ dopamine transporter؛ fan-beam collimator
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