Okayama University Medical School Acta Medica Okayama 0386-300X 67 2 2013 The Maximum Standardized Uptake Value Is More Reliable Than Size Measurement in Early Follow-up to Evaluate Potential Pulmonary Malignancies Following Radiofrequency Ablation 105 112 EN Aierken Alafate Takayoshi Shinya Yoshihiro Okumura Shuhei Sato Takao Hiraki Hiroaki Ishii Hideo Gobara Katsuya Kato Toshiyoshi Fujiwara Shinichiro Miyoshi Mitsumasa Kaji Susumu Kanazawa Original Article 10.18926/AMO/49669 We retrospectively evaluated the accumulation of fluorodeoxy glucose (FDG) in pulmonary malignancies without local recurrence during 2-year follow-up on positron emission tomography (PET)/computed tomography (CT) after radiofrequency ablation (RFA). Thirty tumors in 25 patients were studied (10 non-small cell lung cancers;20 pulmonary metastatic tumors). PET/CT was performed before RFA, 3 months after RFA, and 6 months after RFA. We assessed the FDG accumulation with the maximum standardized uptake value (SUVmax) compared with the diameters of the lesions. The SUVmax had a decreasing tendency in the first 6 months and, at 6 months post-ablation, FDG accumulation was less affected by inflammatory changes than at 3 months post-RFA. The diameter of the ablated lesion exceeded that of the initial tumor at 3 months post-RFA and shrank to pre-ablation dimensions by 6 months post-RFA. SUVmax was more reliable than the size measurements by CT in the first 6 months after RFA, and PET/CT at 6 months post-RFA may be more appropriate for the assessment of FDG accumulation than that at 3 months post-RFA. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 0386-9628 32 3 1992 胸部腫瘤性病変における2D-Time of Flight MR Angiography 375 381 EN Masahiko Mitani Izumi Togami Takahiro Kitagawa Katsuya Katoh Susumu Kanazawa Ikuo Joja Yoshio Hiraki Akio Ando Nobuyoshi Shimizu Shigeru Teramoto 正常ボランティア5例, 胸部腫瘤性病変の患者15例に対してMR Angiographyを施行した.MRAは, 6秒の息、止めでFLASH法(TR=20msec, TE=8msec, Flip angle=30°)を用いて撮像した像から作成した.全ての症例で胸部大動脈, 上大静脈, 下大静脈, 肺動脈及び肺静脈根部など太い血管の明瞭なMRA像が得られ, 腫瘤とそれら大血管系との関係が把握しやすく胸部腫瘤性病変の評価に有用と考えられた. No potential conflict of interest relevant to this article was reported.

Okayama University Medical School Acta Medica Okayama 0386-300X 65 4 2011 Preoperative Graft Volume Assessment with 3D-CT Volumetry in Living-Donor Lobar Lung Transplantations 265 268 EN Katsuhide Kojima Katsuya Kato Takahiro Oto Toshiharu Mitsuhashi Takayoshi Shinya Tetsuro Sei Yoshihiro Okumura Shuhei Sato Shinichiro Miyoshi Susumu Kanazawa Original Article 10.18926/AMO/46852 To determine the effectiveness of living-donor lobar lung transplantation (LDLLT), it is necessary to predict the recipient's postoperative lung function. Traditionally, Date's formula, also called the segmental ratio, has used the number of lung segments to estimate the forced vital capacity (FVC) of grafts in LDLLT. To provide a more precise estimate of graft FVC, we calculated the volumes of the lower lobe and total lung using three-dimensional computed tomography (3D-CT) and the volume ratio between them. We calculated the volume ratio in 52 donors and tested the difference between the segmental volume ratios with a one-tailed t-test. We also calculated the predicted graft FVC in 21 LDLLTs using the segmental ratio pFVC(c) and the volume ratio pFVC(v), and then found the Pearson's correlation coefficients for both pFVC(c) and pFVC(v) with the recipients' actual FVC (rFVC) measured spirometrically 6 months after surgery. Significant differences were found between the segmental ratio and the average volume ratio for both sides (right, p＝0.03;left, p＝0.0003). Both pFVC(c) and pFVC(v) correlated significantly with rFVC at 6 months after surgery (p＝0.007 and 0.006). Both the conventional and the volumetric methods provided FVC predictions that correlated significantly with measured postoperative FVC. No potential conflict of interest relevant to this article was reported.

岡山医学会 Acta Medica Okayama 0030-1558 107 7-8 1995 T2*強調gradient echo法を用いたdynamic MRIによる腎機能評価に関する研究 79 90 EN Katsuya Kato To evaluate the usefulness of dynamic MRI of kidneys in healthy volunteers and patients with different 24-hour creatinine clearance (Ccr) levels, a dynamic study that employed the T2* weighted gradient echo technique (FLASH : TR/TE=34/25msec,flip angle=20 degrees) with single images during breathhold was performed on 10 healthy volunteers and 35 patients, all examined for the Ccr and suspected of having renal parenchmal disease after a phantom study. T1-weighted and dynamic MR imagings were obtained with a 1.5T imager.I andalyzed the time-intensity curve of renal cortex and medulla, and defined a cortex decreased ratio (CDR) and medulla decreased ratio (MDR) in comparison with the Ccr. The cortico-medullary difference ratio (CMDR) of T1WI were better correlated with the Cce. The parameters of the T2* dynamic MRI study (CDR, MDR) were better correlated with the Ccr than CMDR. Renal function can be quantitatively evaluated with the T2* dynamic MRI and there ia s possibility that we can qualitatively evaluate the renal dysfunction and estimate its cause. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 1995 T2* 強調 gradient echo 法を用いた dynamic MRI による腎機能評価に関する研究 EN No potential conflict of interest relevant to this article was reported.