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Biomedical subjects

T Ishiguchi

Publications and source records attributed to T Ishiguchi.

At least 73 records · Page 4Linked to original sources
PubMed1980

[The comparative study of renogram both in case of dehydration and hydration (author's transl)].

In order to study the merit or demerit of the dehydration or hydration as the preparation of renographic examination, the following 25 cases--11 cases of uterine cancer, 2 cases of breast cancer, a case of esophageal cancer, pharyngeal cancer, maxillary cancer, salivary gland tumor, leiomyosarcoma of uterus and others are examined by renography using 131I-hippurate. Renogram is performed in case of patient's dehydration and followed in case of patient's hydration with 600 ml of water intake. Renographic findings such as Tmax, T1/2, HB/HA and step-like pattern are studied as a parameter. Following 600 ml water intake, Tmax is significantly shortened and the step-like pattern is disappeared. This study is strongly suggested that patient's hydration is significantly necessary in the performance of renogram as the preparatory procedure.

Aged↗
PubMed1979

[Clinical evaluation of 67Ga-citrate scintigraphy with reference to tumor detectability (author's transl)].

The clinical usefulness of 67Ga-citrate whole body scanning is evaluated in 178 cases of the various diseases in a period of 1976-1978. The cases are 59 cases of thoracic lesions, 41 cases of head and neck lesions, 35 cases of abdominal, bone, and soft tissue lesions, and 43 cases of benign and malignant lymphoma. The clinical results and detectability of various known lesions are shown in tables 1, 2, 3 and 4. The detectability of unknown lesions of malignant lymphoma is shown in table 5. The study demonstrates the particular clinical values of 67Ga-citrate scan in detectability of unknown lesions to be in cases of malignant lymphoma.

Adult↗
PubMedDate not supplied

Radiologic diagnosis of hepatocellular carcinoma.

Recent developments in medical imaging technology and their clinical application for the diagnosis and management of hepatocellular carcinoma (HCC) are reviewed. Real-time ultrasound is effective for the screening of HCC in high-risk patients with liver cirrhosis. Information on blood flow is available by color Doppler or power Doppler technique. Dynamic computed tomography (CT) using a fast scanner and the modified contrast administration technique is useful for detection, differential diagnosis, and staging of HCC. Application of magnetic resonance (MR) imaging is increasing with rapid improvements in speed of image acquisition and resolution. Dynamic MR imaging and MR angiography have also been available. Diagnostic and interventional hepatic angiography are now performed less invasively, more safely, and more quickly with modern technologies of digital subtraction angiography (DSA) and catheters. CT during hepatic arteriography (CT arteriography) and arterial portography (CTAP) are used for evaluation of small focal nodules in the cirrhotic liver.

Carcinoma, Hepatocellular↗
PubMedDate not supplied

Radiologic diagnosis of pancreatic carcinoma.

Radiological diagnostic techniques for the evaluation of pancreatic duct cell adenocarcinoma and their findings are discussed. Pancreatic carcinoma may demonstrate one or more of these diagnostic signs: focal enlargement or deformity, density changes, obliteration and dilatation of the pancreatic and/or biliary duct, local invasion, and metastases. Ultrasonography is commonly used as a screening examination. The presence of pancreatic carcinoma may best be evaluated by dynamic computed tomography (CT) or dynamic magnetic resonance (MR) imaging with administration of intravenous contrast material. Both CT and MR imaging are used for the preoperative assessment of local invasion and vascular involvement. MR cholangiopancreatography (MRCP) allows noninvasive three-dimensional delineation of the pancreatic and biliary duct systems. Angiography may demonstrate vascular involvement questionable on noninvasive examinations. In the near future, the value and efficacy of MR imaging in the diagnosis of small pancreatic carcinoma need to be assessed in comparison with CT and endoscopic studies.

Angiography↗
PubMedDate not supplied

Dilatation of stent-grafts by luminal pressures: experimental evaluation of polytetrafluoroethylene (PTFE) and woven polyester grafts.

PURPOSE: To evaluate the effect on dilatation of three types of covering materials used for endovascular stent-grafts. METHODS: Stent-grafts with three types of covering material [0.1-mm polytetrafluoroethylene (PTFE), 0.2-mm PTFE, and 0.15-mm woven polyester] were placed in a fluid circuit. For the pulsatile pressure test, the luminal pressure of 190/130 mmHg was loaded up to 300,000 pulses. For the static pressure test, the luminal pressure was increased from 50 to 300 mmHg at 50-mmHg increments. The percent of dilatation of each stent-graft was compared. RESULTS: The 0.1-mm PTFE stent-graft was significantly more dilated than the 0.2-mm PTFE and the 0.15-mm woven polyester stent-graft (p < 0.005) in both examinations. There was no significant difference between the 0.2-mm PTFE and the 0.15-mm woven polyester stent-grafts. The dilatation of the 0.1-mm PTFE stent-graft was irreversible. CONCLUSION: The 0.15-mm woven polyester and the 0.2-mm PTFE stent-grafts may be preferable to the 0.1-mm PTFE stent-graft with regard to dilatation and deformity.

Aortic Aneurysm↗
PubMedDate not supplied

Efficacy of gastric blood supply redistribution by transarterial embolization: preoperative procedure to prevent postoperative anastomotic leaks following esophagoplasty for esophageal carcinoma.

PURPOSE: The aim of this study was to evaluate the effect of preoperative redistribution of gastric blood supply on the prevention of anastomotic leakage following surgical reconstruction of the esophagus. METHODS: In 37 patients with esophageal carcinoma, transarterial embolization (TAE) of the left gastric, right gastric, and splenic arteries was preoperatively performed with coils so that gastric blood supply was dependent only on the right gastroepiploic artery. RESULTS: In 34 of 37 patients, preoperative redistribution was successfully performed. The gastric tissue blood flow (TBF) of a gastric tube was higher than in 12 nonredistributed patients. Reduction in the gastric TBF during preparation of a gastric tube was 27.5% in successful patients, in contrast to 68.9% in 12 nonredistributed patients (p < 0.005). CONCLUSION: Preoperative redistribution by TAE reduced the drop in gastric TBF during preparation of a gastric tube and helped prevent postoperative anastomotic leakage in esophageal reconstruction.

Adult↗