| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
The basic studies using 4-5 F catheters demonstrated that the quality in three-dimensional images generated from 0.5-mm slice thickness at 0.5-mm intervals was superior to that from 1-mm slice thickness at 0.5-mm intervals. For the evaluation of known or suspected diseases of the pancreas and biliary system, multiphase contrast-enhanced CT was performed with a detector configuration of 4 x 0.5-mm and a pitch of 5.5 using a multislice CT scanner. The multiplanar reformatted (MPR) images were reconstructed with 0.5-mm thickness at 0.5-mm intervals to cover the pancreatic parenchyma from the pancreatic phase images, which were also reconstructed with 0.5-mm thickness at 0.5-mm intervals using a 256-mm field of view. The oblique angles for the MPR images were selected to follow the course of the main pancreatic duct. The MPR images combined with 0.5-mm axial images were significantly superior to 0.5-mm axial and 2-mm axial images alone for the visualization of the pancreatic and intrapancreatic bile ducts and their confluence (p<0.01). The depiction rate of the main pancreatic duct using MPR images combined with 0.5-mm axial images was 94,94,95,and 75 %, respectively in the head, neck, body, and tail of the pancreas. Accessory pancreatic ducts, intrapancreatic bile ducts, and duct confluence were depicted in 48,99,and 92 %, respectively. The use of these high-resolution MPR images more clearly demonstrated the relationship between the lesions and the pancreatic and bile ducts, which was useful for the diagnosis of pancreatic cystic lesions such as intraductal papillary mucinous tumor. Additionally, the results of evaluating the effects of the injection rate of contrast material on enhancement in multiphase CT using a multislice CT scanner showed that shortening the injection duration for a given volume of contrast material can achieve an almost exclusively arterial phase with maximum arterial enhancement.
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