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Biomedical subjects

M Amanuma

Publications and source records attributed to M Amanuma.

26 records · Page 2Linked to original sources
PubMed1989

[MR imaging of the bone marrow using short TI IR. Part 2--Normal and pathological intensity distribution of the bone marrow].

Bone marrow pathology of hematological neoplasms was evaluated using short TI IR sequences and T2 weighted STIR (IR 1500/100/40, IR 1500/100/80). Material consisted of 49 individuals including 10 leukemias, 5 myelofibroses and 30 multiple myelomas. On IR 1500/100/40, all cases revealed heterogenously or diffusely high intensity. On IR 1500/100/80, both of acute and chronic myelocytic leukemias revealed definite signal decrease, while chronic lymphocytic leukemia, myelofibrosis and multiple myeloma showed no obvious signal decrease.

Adolescent↗
PubMedDate not supplied

MR imaging of age-related dimensional changes of thoracic aorta.

Changes in the dimensions of the thoracic aorta with age were studied in 70 healthy volunteers between the ages of 10 and 83 years. Spin echo images were acquired at end-diastole in three oblique planes through the ascending aorta, aortic arch, and descending aorta. A double oblique image through the whole of the thoracic aorta was also acquired. Measurements of aortic cross-sectional area and length were corrected for body surface area, and normal magnetic resonance standards were established. The direct correlation that aortic dimensions have with age is likely to be due to loss of elasticity. The ratio between areas of the ascending aorta and the aortic arch is directly related to age whereas the ratio between the aortic arch and the descending aorta is inversely related to age.

Adolescent↗
PubMedDate not supplied

MR phase-shift velocity mapping of mitral and pulmonary venous flow.

Mitral and pulmonary venous flows are important indexes in the evaluation of left ventricular diastolic function and in the assessment of mitral valve disease. We used MR phase-shift velocity mapping to measure mitral and pulmonary venous flow velocity in 10 healthy volunteers and mitral flow velocity in 5 patients with mitral valve stenosis. Normal mitral flow shows two positive peaks: one during early ventricular diastole and the other during atrial contraction. Peak mitral flow velocity (mean +/- SD) in early diastole was 68 +/- 12 cm/s and during atrial contraction 39 +/- 10 cm/s. The ratio of peak mitral flow velocity in early diastole to that during atrial contraction was 1.9 +/- 0.6. In patients with mitral valve stenosis, the initial high flow velocity persisted through diastole. Peak mitral flow velocity of patients with mitral valve stenosis correlated well with values obtained from Doppler echocardiography. Pulmonary venous flow showed two positive peaks: one during ventricular systole and the other in ventricular diastole. A small backflow during atrial contraction was noticed. Peak systolic velocity in the right lower pulmonary vein was 47 +/- 11 cm/s, peak diastolic velocity was 40 +/- 9 cm/s, and peak backflow velocity was 14 +/- 3 cm/s. Magnetic resonance velocity mapping is a noninvasive technique for the evaluation of time-related flow velocity patterns and for quantitative measurement of mitral and pulmonary venous blood flow velocity.

Adult↗
PubMedDate not supplied

Teleradiology at Gunma University Hospital.

Using NEC MediFile 1000 and the public telephone system, the Department of Radiology of Gunma University Hospital and Saitama Medical School deliver image diagnosis to fellow clinicians and affiliated hospitals. The system consists of digitizing, filing, processing, retrieving and archiving units for radiographs and documents. Images were digitized by CCD and filed in 2 Gbyte double sided optical disk, which can accommodate 500 sheets of 14 x 17 films on 1500 of the smallest size slats without data compression. Image resolution was evaluated by ROC curve using multiple pulmonary nodules. The time taken for image transfer over 24 km was tested with various film sizes, image varieties and data compression rates.

Computer Communication Networks↗