The Experts below are selected from a list of 34326 Experts worldwide ranked by ideXlab platform

Abhishek Sharma - One of the best experts on this subject based on the ideXlab platform.

Michael Galanski - One of the best experts on this subject based on the ideXlab platform.

  • Minimally invasive diagnosis of renal artery stenosis by spiral Computed Tomography Angiography
    Kidney international, 1995
    Co-Authors: Christoph J. Olbricht, Katrin Paul, Mathias Prokop, Ajay Chavan, Cornelia Schaefer-prokop, K. Jandeleit, Karl M. Koch, Michael Galanski
    Abstract:

    Minimally invasive diagnosis of renal artery stenosis by spiral Computed Tomography Angiography. We prospectively compared in a blinded fashion spiral Computed Tomography Angiography (CTA) with arteriography in 62 consecutive patients with suspected renal artery stenosis (RAS). For CTA 150 ml of contrast material were injected intravenously. Arteriography was performed by DSA technique with selective catheterization of renal arteries. Of the 157 visualized renal arteries 155 could be evaluated with DSA and a total of 157 with CTA. Sensitivity of CTA for RAS ≥ 50% was 98% and the specificity was 94%. Comparison of the grade of stenosis as evaluated by DSA versus CTA showed: identical gradation in 59 arteries (DSA ≥ 50%/CTA ≥ 50%), underestimation by CTA in one artery (DSA 50 to 75%/CTA

Christoph J. Olbricht - One of the best experts on this subject based on the ideXlab platform.

  • Minimally invasive diagnosis of renal artery stenosis by spiral Computed Tomography Angiography
    Kidney international, 1995
    Co-Authors: Christoph J. Olbricht, Katrin Paul, Mathias Prokop, Ajay Chavan, Cornelia Schaefer-prokop, K. Jandeleit, Karl M. Koch, Michael Galanski
    Abstract:

    Minimally invasive diagnosis of renal artery stenosis by spiral Computed Tomography Angiography. We prospectively compared in a blinded fashion spiral Computed Tomography Angiography (CTA) with arteriography in 62 consecutive patients with suspected renal artery stenosis (RAS). For CTA 150 ml of contrast material were injected intravenously. Arteriography was performed by DSA technique with selective catheterization of renal arteries. Of the 157 visualized renal arteries 155 could be evaluated with DSA and a total of 157 with CTA. Sensitivity of CTA for RAS ≥ 50% was 98% and the specificity was 94%. Comparison of the grade of stenosis as evaluated by DSA versus CTA showed: identical gradation in 59 arteries (DSA ≥ 50%/CTA ≥ 50%), underestimation by CTA in one artery (DSA 50 to 75%/CTA

Jian Sun - One of the best experts on this subject based on the ideXlab platform.

  • Application of Computed Tomography Angiography Mapping and Located Template for Accurate Location of Perforator in Head and Neck Reconstruction with Anterolateral Thigh Perforator Flap.
    Plastic and reconstructive surgery, 2016
    Co-Authors: Yi Shen, Jian Huang, Min-jun Dong, Jian Sun
    Abstract:

    Background: The authors introduce a new method of preoperative Computed Tomography Angiography mapping and virtual and printed located template for accurate location of perforators in the anterolateral thigh perforator flap for head and neck reconstruction. Methods: Between April and December of 2014, a cohort study was performed with 29 patients who underwent head and neck reconstruction with anterolateral thigh perforator flaps. Computed Tomography Angiography images were processed for maximum intensity projection and volume rendering to obtain and evaluate the perforator information. The virtual and printed templates with grid were used to transfer the perforator information for intraoperative guidance during flap harvest. The preoperative Angiography results were compared with the high-frequency color Doppler results and with the intraoperative real-time findings to evaluate the accuracy of Computed Tomography Angiography mapping. Results: The source vessel, origin, location, direction, number, and caliber of the perforators were determined by preoperative Computed Tomography Angiography mapping. All of the perforator data were accurately mapped on a virtual template and printed on the located template to guide flap harvest. The flap was actually used and survived successfully in 20 patients. The results for perforators identified by mapping were more accurate than those for perforators identified by Doppler. There was no significant difference between the preoperative Computed Tomography Angiography results and the intraoperative findings (p > 0.05). Conclusions: The role of preoperative Computed Tomography Angiography mapping in guiding anterolateral thigh perforator flap harvest and reducing the unpredictable risk of surgery is acceptable. Located virtual and printed template with grid can transform preoperative Computed Tomography Angiography information to the intraoperative setting accurately and easily. CLINICAL QUESTION/LEVEL OF EVIDENCE: Diagnostic, II.

Shinji Naganawa - One of the best experts on this subject based on the ideXlab platform.

  • planning of segmentectomy using three dimensional Computed Tomography Angiography with a virtual safety margin technique and initial experience
    Lung Cancer, 2013
    Co-Authors: Shingo Iwano, Kohei Yokoi, Tetsuo Taniguchi, Koji Kawaguchi, Takayuki Fukui, Shinji Naganawa
    Abstract:

    Abstract Objectives In preoperative segmentectomy simulation for primary lung cancer, it is important to identify the intersegmental pulmonary veins and the relationship between them and the surgical safety margin. We have adopted a method that incorporates a virtual safety margin into three-dimensional Computed Tomography Angiography images in order to plan adequate segmentectomy for lung cancer patients. In this study, we describe the new preoperative planning technique and review cases in which we performed segmentectomy based on its results. Methods We reviewed clinical, radiological, and pathological records and selected patients who underwent segmentectomy for a primary lung cancer lesion with a diameter of 2 cm or less. These segmentectomies were planned using preoperative three-dimensional Computed Tomography Angiography with a virtual safety margin. Results A total of 17 primary lung cancers in 16 patients (11 male and 5 female, aged 52–82 years) were removed by segmentectomy, planned using the new technique. In 6 of 17 tumors (35%) were non-solid type adenocarcinomas, 3 tumors (18%) were partly solid type adenocarcinomas, 6 tumors (35%) were solid type adenocarcinomas and 2 tumors (12%) were squamous cell carcinomas. Pathological examination revealed no positive surgical margins and no lymph node metastases in any patients. Conclusions Three-dimensional Computed Tomography Angiography with a virtual safety margin was able to non-invasively visualize the three-dimensional distances and the relationships between the primary tumor and intersegmental pulmonary veins. It was able to aid in the preoperative planning of a suitable segmentectomy procedure for patients with a primary lung cancer lesion of 2 cm or less in diameter.