Ultra-high-resolution CT (UHRCT) as an Alternative Procedure to Gastric Cancer Screening

Ultra-high-resolution CT (UHRCT) as an Alternative Procedure to Gastric Cancer Screening

H Moriya, MD, Fukushima, Fukushima JAPAN; M Suzuki; K Hashimoto; S Muramatsu, RT; Y Kumasaka; S Tsukagoshi, PhD

TEACHING POINTS

Due to the pandemic spread of COVID-19, the number of cases where conventional medical diagnosis cannot be performed is increasing. For example, gastrointestinal endoscopy. Ultra-high-resolution CT (UHRCT) is capable of whole-body scanning with high-spatial solution of 0.15 mm. This resolution is approaching that of fluoroscopy, and it can be performed without contact with the patient's oral cavity. In this presentation, the accuracy of gastrointestinal diagnosis by UHRCT is presented.

TABLE OF CONTENTS/OUTLINE

1. Method of gastric examination using UHRCT: UHRCT (Aquilion precision, Canon Medical Systems) with SHR or HR mode was used. Deep learning reconstruction was used for noise reduction. The effervescent granules with a low quantity of water was applied for optimal gastric distention. 2. The shape of the gastric lumen could be displayed by a VR image with transparency. 3. MPR image clearly revealed stomach wall. 4. 3D-CTA revealed individual arteries and veins around the stomach. There were some cases that were able to visualize the vessel convergence of the gastric cancer. 5. Virtual gastroscopy clarified the localization of gastric lesion in the lumen like an actual endoscope. 6. UHRCT enabled the screening and assessment of gastric cancer without contact with the patient's oral cavity.