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Biomedical subjects

K Katada

Publications and source records attributed to K Katada.

85 records · Page 5Linked to original sources
PubMed1978

CT in evaluation of the circle of Willis.

The method of visualizing the circle of Willis intentionally on contrast-enhanced CT scan was studied. The incidence of circle of Willis in our series was 86%. Only mild side effects were observed, in 7.5% of cases. CT of 60 proven cerebral aneurysms were reviewed and aneurysm was detected in 57%. This method has the potential to be a noninvasive screening procedure for evaluation of suspected cerebral aneurysm, as well as evaluation of marked arteriosclerosis, occlusion of major arteries, and mass effect of parasellar tumors.

Cerebral Angiography↗
PubMed1977

[Classification of intracerebral hematoma (lateral type) on C.T. and its relation to the shift of the lenticulostriate arteries (author's transl)].

Classification of intracerebral hematoma (lateral type) with C.T. was tried. And also, the relationship among the location of the hematoma, the shift of the lenticulostriate arteries and the prognosis of hemiparesis was verified. The results were as follows; 1) The location of the hematoma was classified into four types: 1. anterior type (the hematoma mainly located in the anterior limb of internal capsula). 2. Posterior type (the hematoma mainly located in the posterior limb of internal capsula). 3. lateral type (the hematoma mainly located just below the insula). 4. spread to the all direction type. 2) The lenticulostriate arteries was divided into three portions: L1 portion is the part from the origin at the middle cerebral artery to the knee point, L3 is the part of the distal portion of the lenticulostriate arteries, and L2 portion in the part between L1 and L3 portions. L1 portion was mainly shifted medially in the anterior type of the hematoma. L2 portion was mainly shifted medially in the lateral type of the hematoma. L3 portion was mainly shifted in the posterior type of the hematoma. L1, L2, L3, all portions were shifted medially in the type in which the hematoma spread to all directions 3) The prognosis of the hemiparesis was best in the lateral type of the hematoma, and next in the anterior type. In the posterior type and all spread type, it was worst.

Cerebral Angiography↗
PubMedDate not supplied

Minor changes in regional cerebral blood flow revealed by the early distribution of I-123 IMP in brain.

To evaluate the early distribution of I-123 IMP in the brain, 10 dynamic images were obtained in the first 10 minutes after injection using a ring-type SPECT system with a high-sensitivity collimator. In cases of chronic carotid occlusion without brain CT abnormalities, areas of low perfusion were more clearly demonstrated in dynamic images than in static images obtained beginning 20 minutes after injection and continuing for 15 minutes using a high-resolution collimator. In cases of hyperperfusion following infarct or surgery, there was a difference between dynamic and static images in the visualization of hyperemic lesions. The distribution of I-123 IMP in the brain changes gradually, even in the early period after injection, and evaluation of early accumulation is useful for the detection of minor changes in regional cerebral blood flow.

Aged↗
PubMedDate not supplied

Calcification of the vertebral artery.

A series of 3,648 computed tomographic (CT) scans was reviewed to determine the incidence of intracranial vertebral artery calcification. Calcification was identified in one or both vertebral arteries in 3.4% and was more frequent in the higher age groups. Skull radiographs demonstrated vertebral artery calcification in only one of 48 patients in whom CT studies showed it. A high correlation was observed between vertebral artery calcification on CT and vertebral artery stenosis on cerebral angiography.

Adult↗