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Biomedical subjects

T Tomaru

Publications and source records attributed to T Tomaru.

At least 109 records · Page 6Linked to original sources
PubMed1984

[Standardized radiation treatment method for carcinoma of the uterine cervix].

Due to a world-wide information exchange on cancer therapy, a standardized treatment method for cancer is desirable. Radiation therapy for carcinoma of the uterine cervix is usually in combination with external and intracavitary irradiation. A basic treatment regiment for carcinoma of the uterine cervix with external and intracavitary irradiation was established by the major Japanese institutions. The consensus include: size and shape of irradiation field, dose, the reference from which to calculate the point A dose the external orifice of cervix is point A dose is regarded as the minor dose between right and left point As', categorized treatment methods with RALS according to cancer stage, the post operative irradiation method. This standardized treatment method will be applied for data analysis at each institution and will promote the further development of radiation therapy.

Brachytherapy↗
PubMed1982

[A correlative study of M-mode echocardiograms and pathological findings in mitral ring calcification].

Correlation between pathologically proved mitral ring calcification (MRC) and M-mode echocardiographic findings was examined. Subjects for this study were 36 aged autopsy cases of MRC (14 men, 22 women) with a mean age of 78.9 years. Echocardiographic diagnosis of MRC was based upon the following criteria; a dense echo that moves parallel to the endocardium of the left ventricular posterior wall, immediately posterior to the mitral leaflet and its abrupt termination during a sweep of the beam to the left atrium and left ventricle. The length along the mitral ring and its maximal cross-sectional diameter of MRC were measured pathologically. Extension of MRC to the mitral commissures was also evaluated. The following results were obtained; (1) The larger was the size of MRC measured pathologically, the more it was easily diagnosed by echocardiography. (2) The width of MRC in the echocardiogram correlated well with the pathologically measured maximal cross-sectional diameter of MRC (r = 0.67, p less than 0.01). (3) Sensitivity in the diagnosis of MRC was better in the echocardiograms (58.3%) than in the plain chest X-ray films (38.9%) (p less than 0.05). The length of MRC equal to or greater than 30 mm was diagnosed in all by the echocardiograms. In contrast, only 78.6% of these were diagnosed by plain X-ray films. (4) When cases with MRC were divided into 2 groups according to the mitral diastolic descent rate (MDDR), the decreased group (MDDR less than 35 mm) had a significantly longer length of MRC (32.4 +/- 15.5 mm) than the non-decreased group (16.6 +/- 20.9 mm) (p less than 0.05). Extension of MRC to the mitral commissures was more frequently observed in the group with decreased MDDR than in non-decreased group (p less than 0.005). From these observations, it was suggested that mechanical restriction of the movement of the anterior mitral; leaflet due to involvement of the commissures by MRC may be a contributing factor for decreased MDDR. (5) Identification of echoes from the posterior mitral leaflet and the left ventricular posterior wall was difficult in cases with positive MRC echoes.

Aged↗
PubMed1978

[A new method for elimination of artifacts produced by collimator septum effect in gamma-camera images (author's transl)].

Collimator artifacts may be present within the images produced by collimators whose septal width approaches the inherent resolution of the gamma-camera system. As the inherent resolution of the gamma-camera is improved, collimator artifacts become more prominent. The purpose of this study is to eliminate collimator artifacts from gamma-camera images. To eliminate the septum effect produced by high-energy parallel-hole collimators with thick septa, the following method was used: X and Y signals from the detector are made to ride on the triangular waves changing periodically, and resultant position signals obtained by this processing are applied to the corresponding deflection circuits in the CRT display. The oscillation amplitude of processed position signals can be regulated by the frequency and amplitude of the triangular waves. Regulation of the oscillation amplitude of position signals, which would produce maximum reduction of collimator artifacts, was to approach the spatial frequency responses of the overall processed line spread functions obtained experimentally to those of the Gaussian functions with FWHM equal to the geometric resolution calculated from the equation given by Gerber and Miller. In images of a pancreas phantom containing 131I, collimator artifacts were clearly seen in the unprocessed case, but were eliminated in the processed case.

Models, Theoretical↗