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.

Okayama University Medical School Acta Medica Okayama 0386-300X 47 2 1993 Multivariate analysis of magnetic resonance imaging of focal hepatic lesions. 117 120 EN Mamoru Fujishima Ichizou Suemitsu Tetsurou Sei Yoshihiro Takeda Yoshio Hiraki Article 10.18926/AMO/31576 <p>A total of 124 lesions from 1 to 6cm in diameter, including 31 cavernous hemangiomas, 32 metastases and 61 hepatocellular carcinomas (HCC) were analyzed to study the usefulness of magnetic resonance imaging (MRI) at 0.5 Tesla to differentiate focal hepatic lesions on the basis of qualitative criteria. Each focal hepatic lesion was assessed for shape, internal architecture and signal intensity relative to normal liver parenchyma. While all cavernous hemangiomas and metastases except one lesion could be detected, detection rate of HCC was significantly inferior to that of the other two diseases. A tumor capsule and a hyperintense focus on T1-weighted images were demonstrated in only HCC lesions in strong contrast with the other two diseases; however, metastases with slow-growing characteristics or subacute hematoma may appear as similar images. Cavernous hemangiomas appeared markedly hyperintense on T2-weighted images in 23 of 31 lesions, but one metastasis and one HCC had similar images. A multivariate analysis of several MRI resulted in the following mean discriminant scores: cavernous hemangioma, -1.2652; metastasis, 0.1830; and HCC, 0.7138. It appeared to be possible to differentiate the three diseases with 84.4 percent accuracy.</p> No potential conflict of interest relevant to this article was reported.

岡山医学会 Acta Medica Okayama 0030-1558 106 1-2 1994 シネ MRI の画像解析による心機能の定量評価に関する研究 163 171 EN Tetsurou Sei Non-invasive techniques for measuring the dynamic behavior of the cardiac ventricle can be invaluable tool for diagnosing heart disease. In this paper, we present methods for quantia-tive analysis of cardiac function using magnetic rasonance images. A 256×256 magnetic resonance transaxial image of the cardiac ventricle was obtained from a healthy subject. After gray level thresholding and region segmentation, the bounday of the ventricular chamber was extracted. Then, the boundaries of the ventricular chamber were displayed therr-dimensionally using the Z-buffer algoritm. Thus, ventricular volume and ejection fraction were calcullated. In our example, left ventricular ejection fraction was 61%. These results agree with the corresponding data obtained by the echo-cardiography. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 1994 シネMRIの画像解析による心機能の定量評価に関する研究 EN No potential conflict of interest relevant to this article was reported.