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論文
論文
1. パラレルイメージングプログラムの開発
今井, 広 ; 春日, 敏夫 ; 宮地, 利明 ; 笠井, 治昌 ; 川野, 誠 ; 杉山, 雅之
出版情報: 医用画像情報学会雑誌 = Medical Imaging and Information Sciences.  20  pp.27-33,  2003-01-01.  医用画像情報学会 = MII: Japan Society of Medical Imaging and Information Sciences
URL: http://hdl.handle.net/2297/36648
概要: Parallel imaging in magnetic resonance imaging (MRI) is a method to reduce the acquisition time by using phased array coils. However, there are a small number of commercial diagnostic MR imagers which could be used that method. Therefore, … we developed a parallel imaging program for sensitivity encoding (SENSE). We produced sensitivity maps calculated from phantom images which was obtained with each coil element. Next, we eliminated wrap-around artifacts by using the sensitivity maps. Parallel imaging with SENSE made it possible to achieve fast scan or remove wrap-around artifacts. 続きを見る
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論文
論文
2. Nuclear myocardial perfusion imaging using thallium-201 with a novel multifocal collimator SPECT/CT: IQ-SPECT versus conventional protocols in normal subjects
Matsuo, Shinro ; Nakajima, Kenichi ; Onoguchi, Masahisa ; Wakabayashi, Hiroshi ; Okuda, Koichi ; Kinuya, Seigo
出版情報: Annals of Nuclear Medicine.  29  pp.452-459,  2015-06-01.  The Japanese Society of Nuclear Medicine = 日本核医学会 / Springer-Verlag Tokyo
URL: http://hdl.handle.net/2297/43922
概要: Objective A novel multifocal collimator, IQ-SPECT (Siemens) consists of SMARTZOOM, cardio-centric and 3D iterative SPECT … reconstruction and makes it possible to perform MPI scans in a short time. The aims are to delineate the normal uptake in thallium-201 (201Tl) SPECT in each acquisition method and to compare the distribution between new and conventional protocol, especially in patients with normal imaging. Methods Forty patients (eight women, mean age of 75 years) who underwent myocardial perfusion imaging were included in the study. All patients underwent one-day protocol perfusion scan after an adenosine-stress test and at rest after administering201Tl and showed normal results. Acquisition was performed on a Symbia T6 equipped with a conventional dual-headed gamma camera system (Siemens ECAM) and with a multifocal SMARTZOOM collimator. Imaging was performed with a conventional system followed by IQ-SPECT/computed tomography (CT). Reconstruction was performed with or without X-ray CT-derived attenuation correction (AC). Two nuclear physicians blinded to clinical information interpreted all myocardial perfusion images. A semi-quantitative myocardial perfusion was analyzed by a 17-segment model with a 5-point visual scoring. The uptake of each segment was measured and left ventricular functions were analyzed by QPS software. Results IQ-SPECT provided good or excellent image quality. The quality of IQ-SPECT images without AC was similar to those of conventional LEHR study. Mid-inferior defect score (0.3 ± 0.5) in the conventional LEHR study was increased significantly in IQ-SPECT with AC (0 ± 0). IQ-SPECT with AC improved the mid-inferior decreased perfusion shown in conventional images. The apical tracer count in IQ-SPECT with AC was decreased compared to that in LEHR (0.1 ± 0.3 vs. 0.5 ± 0.7, p˂0.05). The left ventricular ejection fraction from IQ-SPECT was significantly higher than that from the LEHR collimator (p = 0.0009). Conclusion The images of IQ-SPECT acquired in a short time are equivalent to that of conventional LEHR. The results indicated that the IQ-SPECT system with AC is capable of correcting inferior artifacts with high image quality. © The Japanese Society of Nuclear Medicine 2015. 続きを見る