Improvement in PET/CT image quality in overweight patients with PSF and TOF
| Autor: | Shingo Baba, Yukiko Kasahara, Go Akamatsu, Shohei Mikasa, Katsuhiko Mitsumoto, Kazuhiko Himuro, Yuji Tsutsui, Masayuki Sasaki, Takafumi Taniguchi, Daisuke Kidera |
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| Rok vydání: | 2014 |
| Předmět: |
Point spread function
Adult Male medicine.medical_specialty Image quality PET/CT Overweight Models Biological Multimodal Imaging Fluorodeoxyglucose F18 Medicine Humans Radiology Nuclear Medicine and imaging Aged Retrospective Studies Multimodal imaging Aged 80 and over PET-CT medicine.diagnostic_test business.industry Phantoms Imaging Time-of-flight General Medicine Middle Aged equipment and supplies Point-spread-function body regions Positron emission tomography Radiology Nuclear Medicine and imaging Positron-Emission Tomography Acquisition time Female Original Article Radiology Tomography medicine.symptom Radiopharmaceuticals business Nuclear medicine Tomography X-Ray Computed Algorithms |
| Zdroj: | Annals of Nuclear Medicine |
| ISSN: | 1864-6433 |
| Popis: | Objective The aim of this study was to evaluate the effect of the point spread function (PSF) and time of flight (TOF) on PET/CT images of overweight patients in relation to the iteration number and the acquisition time. Methods This study consisted of a phantom study and a clinical study. The NEMA IEC body phantom and a 40 cm diameter large phantom (LG phantom) simulating an overweight patient were used in this study. Both phantoms were filled with 18F solution with a sphere to background ratio of 4:1. The PET data were reconstructed with the baseline ordered-subsets expectation maximization (OSEM) algorithm, with the OSEM + PSF model, with the OSEM + TOF model and with the OSEM + PSF + TOF model. The clinical study was a retrospective analysis of 66 patients who underwent 18F-FDG PET/CT. The image quality was evaluated using the background variability (coefficient of variance, CVphantom and CVliver) and the contrast (CONTHOT and SNR). Results In phantom study, the CVphantom of the LG phantom was higher than that of the NEMA phantom. The PSF decreased the CVphantom of the LG phantom to the NEMA phantom level. The TOF information accelerated the CVphantom plateau earlier. The best relationship between the CVphantom and the CONTHOT was observed for the OSEM + PSF + TOF. In clinical study, the combination of PSF and TOF decreased the CVliver for overweight patients to that for normal weight patients while it increased the SNR similarly between two patient groups. Conclusion The combination of the PSF and TOF correction improved the image quality of the LG phantom and overweight patients. |
| Databáze: | OpenAIRE |
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