Objective To review the principles and techniques of CT perfusion imaging and its applications in the imaging diagnosis of abdominal disorders. Methods All the relevant literatures were reviewed. The principles and techniques of CT perfusion imaging were described and summarized in detail. The functional information of a target abdominal organ (e.g. the liver and pancreas) revealed by CT perfusion imaging, such as hemodynamics and microcirculation status, was also evaluated. Results In addition to the morphologic information, CT perfusion imaging can also provide functional information about the circulation parameters of target abdominal organs. Moreover, such functional information can be generated for the neovasculature and microcirculation of tumor lesions of abdominal organs, which is very helpful for not only the diagnosis, but also the evaluation of tumor invasiveness and response to treatment. Conclusion CT perfusion imaging offers an effective method for studying abdominal disorders by providing functional information that is quite useful for the differential diagnosis and assessment of therapeutic response.
Objective To introduce the imaging modalities used for the evaluation of postoperative complications of orthotopic liver transplantation (OLT) and to present the imaging findings of these complications. Methods The literatures related to the imaging methods and imaging manifestations of OLT complications were reviewed. Results Ultrasound was the initial imaging technique used for the detection of complications in the early postoperative period. Spiral CT and MRI yielded more accurate and comprehensive evaluation of postoperative complications in later stage. So far, there had been no specific imaging findings to suggest rejection reaction. The spectrum of imaging manifestations of OLT complications, such as vascular complications, biliary complications, liver parenchymal complications, and so on, were summarized and illustrated. Conclusion Imaging examination (especially ultrasound, spiral CT and MRI ) plays an important role in the evaluation of postoperative complications of OLT.
Objective To assess value and limitations of non-invasive methods in assessing liver fibrosis．Methods By summarized current situation and advancement of serum fibrotic markers, ultrasound, CT and MRI in assessing liver fibrosis, we investigated their value and limitations. Results In addition to diagnosis, non-invasive methods of assessing liver fibrosis assess severity of liver fibrosis. For liver fibrosis, however, non-invasive methods can not monitor effectively reaction to therapy and progression. Conclusion Non-invasive methods play important roles in diagnosis and assessing severity of liver fibrosis, and reduce the need of liver biopsy.
Objective To review the current status of magnetic resonance imaging (MRI) techniques in the evaluation of hepatic fibrosis. Methods The application and recent advances of various kinds of MRI techniques in evaluating hepatic fibrosis were summarized by literature review. Results The state-of-the-art of MRI evaluating of hepatic fibrosis included common contrast-enhanced MRI, double contrast-enhanced MRI, and various functional MRI techniques. Common contrast-enhanced MRI could detect morphological changes of the liver, but little value in phasing. Double contrast-enhanced MRI markedly increased the contrast to noise ratio. Except diagnosis liver fibrosis, functional MRI also could phase it by its serverity. Conclusion MRI techniques, especially those functional MRI techniques, are advancing very fast and have very great potentiality in both the diagnosis and severity assessment of hepatic fibrosis.
醫學影像學是臨床醫學科學中發展較快的學科之一。為了將影像檢查技術合理、高效、及時地應用于臨床，為患者服務，需要影像醫師與臨床醫師的密切合作。在具有一定學術地位和雄厚技術力量的本院放射科的鼎力支持與合作下，本刊自2003年第1期起增設“腹部影像”專欄，旨在為腹部外科醫師和腹部影像醫師搭建起一個學術交流的橋梁，促進相互了解、認識、滲透與合作，使腹部外科醫師能及時了解到影像學檢查手段的進展和影像醫學的發展，又能使影像醫師了解到腹部外科醫師對影像檢查的具體要求，從而一方面使影像學檢查技術更好地為腹部外科服務，另一方面又使腹部外科促進影像學檢查的合理化和提高影像診斷水平。基于這一宗旨，本欄目將著重推出一些具有特色、圖文并茂的綜述性文章，作為讓腹部外科醫師了解腹部影像學現狀與進展的的窗口。同時，我們也將選登一些與腹部外科密切相關、臨床實用性比較強的腹部影像學方面的原著介紹給腹部外科醫師。此外，有關影像學檢查的新技術、新方法以及它們在腹部疾病診治中的臨床應用的短篇文章或報道也將是我們選稿的重點。我們殷切希望，本刊增設的這一新欄目能夠得到外科醫師和影像醫師的認可和支持，并讓大家從中獲得有用的信息。我們相信，在主編、各位編委和雜志編輯部的共同努力下，特別是有廣大讀者的支持和鼓勵，背靠華西放射的雄厚技術力量，我們有信心把腹部影像專欄辦好，實現它的宗旨，更好地為臨床工作服務。
Objective To review the CT appearances and important differential diagnoses of various primary and secondary mesenteric neoplasms. Methods By describing the mesenteric anatiomy and major routes for the dissemination of metastatic mesenteric tumors, the article presents both the common and rare types of various primary and secondary mesenteric neoplasms, and addresses the characteristic CT appearances and important aspects of the differential diagnosis. Results CT study, especially the multislice spiral CT (MSCT), along with the clinical history and other related information, can nicely depict various mesenteric tumors and well differentiate them from infectious, inflammatory or vascular processes affecting the mesentery. Conclusion CT is the imaging method of choice for the evaluation of tumors of small bowel mesentery.