医学
霍恩斯菲尔德秤
胰腺
薄壁组织
核医学
癌
胰腺癌
放射科
计算机断层摄影术
病理
内科学
癌症
作者
Kousei Ishigami,Kengo Yoshimitsu,Hiroyuki Irie,Tsuyoshi Tajima,Yoshiki Asayama,Akihiro Nishie,Masakazu Hirakawa,Yasuhiro Ushijima,Daisuke Okamoto,Shigenori Nagata,Yunosuke Nishihara,Koji Yamaguchi,Akinobu Taketomi,Hiroshi Honda
标识
DOI:10.1016/j.ejrad.2007.09.012
摘要
Purpose To assess the value of the delayed phase (DP) in pancreatic carcinomas which appear iso-attenuating in the pancreatic parenchymal phase (PPP). Materials and methods Fifty-seven preoperative MDCT studies of pancreatic carcinomas were retrospectively reviewed. The size of the tumors, and the Hounsfield unit (HU) of the tumors and pancreatic parenchyma were measured. The tumor-to-pancreas contrast (TPC: |HU [tumor] − HU [normal pancreas]|) was calculated. Results Eight cases (14.0%) showed iso-attenuation and 49 showed hypo-attenuation in the PPP. The DP images revealed seven of eight (87.5%) iso-attenuating tumors to be hyper-attenuating. The size of iso-attenuating tumors was smaller than that of hypo-attenuating tumors (mean ± S.D.: 12.4 ± 4.8 mm vs. 30.3 ± 9.0 mm, p < 0.0001). In hypo-attenuating tumors, TPC in the PPP (60.2 ± 24.6 HU) was higher than those in the portal venous phase (PVP, 40.5 ± 23.0 HU, p < 0.0001) and DP (18.3 ± 11.8 HU, p < 0.0001). In contrast, in iso-attenuating tumors, TPC in the DP (26.0 ± 4.9 HU) was higher than those in the PPP (9.2 ± 3.7 HU, p = 0.0003) and PVP (7.1 ± 4.7 HU, p = 0.001) phases. Conclusion The DP image is helpful in depicting small iso-attenuating pancreatic carcinomas as slightly hyper-attenuating tumors.
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