Sadahiro Yamamura, Presenter: Nothing to Disclose

Masanori Imuta MD, Abstract Co-Author: Nothing to Disclose

Seitaro Oda MD, Abstract Co-Author: Nothing to Disclose

Daisuke Utsunomiya MD, Abstract Co-Author: Nothing to Disclose

Yasuyuki Yamashita MD, Abstract Co-Author: Consultant, DAIICHI SANKYO Group

The purpose of our study was to assess the accuracy of the pre-operative staging of the CT colonography (CTC) in patients with colorectal cancer with decreasing in tube voltage from 120- to 100-kVp with iterative reconstruction (IR).

Scanning was performed with 24 consecutive patients who had a diagnosis of colorectal carcinoma in the supine (120-kVp with FBP) and prone (100-kVp with IR) positions, with other parameters unchanged. Two readers visually assessed image quality and the k coefficients were calculated for interobserver agreement. The average image quality ratings were compared using the Wilcoxon signed rank test. We also evaluated the accuracy of the CTC for staging colorectal cancer in both 120-kVp with FBP and 100-kVp with IR.

No significant differences were found in the visual score for the image quality between 120-kVp with FBP and 100-kVp with IR. The interobserver agreement was substantial. CTC with a 100-kVp with IR algorithm identified all the carcinomas and had an overall accuracy of 85%, 64% and 100% for the evaluation of tumor depth, lymph nodes and metastases respectively, and CTC with a 100-kVp with FBP algorithm had an overall accuracy of 81%, 62% and 100%. No significant differences were found in the accuracy of the staging between 120-kVp with FBP and 100-kVp with IR. 

 CTC with a 100-kVp with IR algorithm proved useful for the pre-operative evaluation of patients with a diagnosis of colorectal carcinoma with substantial radiation dose redcution.

CTC with a 100-kVp with IR algorithm proved useful for the pre-operative evaluation of patients with a diagnosis of colorectal carcinoma with substantial radiation dose redcution.

Yamamura, S, Imuta, M, Oda, S, Utsunomiya, D, Yamashita, Y, Pre-operative Staging of the CT Colonography for Patients with Colorectal Cancer: Effect of Low Tube Voltage and Iterative Reconstruction  .  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14045450.html