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Biomedical subjects

F Tsujimoto

Publications and source records attributed to F Tsujimoto.

At least 19 recordsLinked to original sources
PubMed2001

Ultrasound virtual endoscopic imaging.

Volume data acquisition, three dimensional (3D) imaging, and multiplanar reformatting have become widely used for computed tomography (CT) and magnetic resonance imaging (MRI). As an extension of this technology, virtual endoscopic visualization of hollow organs has become a reality that is now finding its way into clinical CT practice. The same methods of computer processing as are used for CT and MRI can be applied to an ultrasound (US) volume image data set with the same potential output; namely, 3D, multiplanar, and virtual endoscopic images. The use of this image processing technology for US applications has lagged behind the CT and MRI applications, but considerable progress in applying these methods to US has occurred in recent years. As a result, US virtual endoscopic imaging now can be performed on a clinical basis by using standard US instruments and commercially available computer software. The use of newer US imaging methods, such as tissue harmonic and power Doppler imaging, has enhanced the potential for US virtual endoscopy. This article reviews the technology of US virtual endoscopy. In addition, our preliminary experience of using this method for abdominal and vascular diagnosis is described. Finally, we speculate on technical improvements and potential applications that are likely in the future.

Acoustics↗
PubMed1994

Ethanol injection sclerotherapy for Baker's cyst, thyroglossal duct cyst, and branchial cleft cyst.

Six patients with Baker's cysts, 3 with branchial cleft cysts, and 2 with thyroglossal duct cysts were treated with percutaneous aspiration and absolute ethanol sclerotherapy using a 7-French pigtail catheter. Cystography was performed before ethanol injection to confirm that there was no extravasation and that it was a monocystic lesion. One recurrence of a Baker's cyst was revealed in follow-up examinations, which ranged from 11 months to 36 months (mean, 25 months). The major complication of hypoesthesia of the popliteal region was observed in 1 patient treated for Baker's cyst. The results of this series suggest that ethanol sclerotherapy is the treatment of choice for Baker's cyst, branchial cleft cyst, and thyroglossal duct cyst.

Adolescent↗
PubMed1990

[Renal calices].

Explore the source record for details and available documents.

Humans↗
PubMed1989

[Temporal changes in internal echoes in hepatic hemangiomas].

We have discovered a fact that there is a temporal changes of internal echo levels in hepatic hemangiomas. Nine hemangiomas in 6 cases diagnosed by CT were studied ultrasonographically by the real-time scanner during the observation period from 4 to 30 minutes. Low echo portions occupying within the tumor (low echo level ratio) showed temporal changes in 8 of 9 hemangiomas during this period. It is important to take temporal factors into consideration for the ultrasonographic diagnosis of hepatic masses. We coined the term "wax and wane" sign to the temporal changes of internal echo levels in the hepatic hemangioma.

Adult↗
PubMed1989

Ultrasonographic findings in gastric cancer: in vitro and in vivo studies.

Ultrasonography was performed in 45 cases of gastric cancer. Specimens from all 45 cases of gastric cancer were subjects to ultrasonographic study by the water immersion method for comparison with histology. In 32 of these 45 cases in vivo ultrasonographic evaluation was performed prospectively. The overall accuracy rates for the diagnosis of the depth of cancerous invasion were almost 80% in both in vitro and in vivo studies. In vivo ultrasonographic findings agreed well with those from the specimen studies. Ultrasonography was considered to be useful in the diagnosis of gastric malignancies.

Humans↗
PubMed1988

Ultrasonographic diagnosis of submucosal tumors of the stomach: the "bridging layers" sign.

The ultrasonic findings in 14 cases with submucosal tumors and one case with extragastric lymphoma using the fluid-filled stomach method were reviewed to determine the appearance of the stomach wall in submucosal tumors. Two characteristic ultrasound features of submucosal tumors were demonstrated in all 14 lesions except in two located high in the fundus of the stomach. One feature was mucosal bridging layers, i.e., three layers could be seen on the mucosal side of the tumors, and at least two of them continued to layers 1 and 2 of the normal gastric wall. The other was a serosal bridging layer, i.e., layer 5 of the normal gastric wall ran toward the serosal side of the tumor. On the basis of a "bridging layers" sign, we believe a definite diagnosis of submucosal tumor can be obtained from ultrasound images.

Diagnosis, Differential↗
PubMed1985

Differentiation of benign from malignant ascites by sonographic evaluation of gallbladder wall.

The gallbladders of 65 patients with ascites were examined on ultrasonograms. In 37 patients, the thickness of the gallbladder wall was less than or equal to 3 mm and was considered normal or "single." In 28 patients, the gallbladder wall thickness was greater than or equal to 4 mm, with a central echo-free zone giving the appearance of a double wall. Of the 37 patients with single-walled gallbladders, 35 (95%) had carcinomatous peritonitis. Of the 28 patients with double-walled gallbladders, 23 (82%) had benign disease, such as liver cirrhosis (n = 22) and nephrotic syndrome with hypoalbuminemia (n = 1). The results of this study indicate that sonography is useful in determining whether the cause of ascites is malignant or benign disease.

Ascites↗