Objectives: This study investigated the radiation dose and value of prospective dualenergy
computed tomography (DECT) in the diagnosis of gastric cancer.
Methods: Sixty patients scheduled for computed tomography (CT) for preoperative staging were
divided into two groups. Thirty patients (Group A) underwent a single contrast-enhanced abdominal
CT acquisition using a dual-source mode (100 kV/140 kV). Weighted average images of the
two-kilovolt acquisitions and iodine maps were created. The remaining 30 patients underwent a
standard CT scan (Group B). Two observers performed a blinded read of the images for gastric lesions,
evaluating the image quality and recording effective dose.
Results: During the blinded read, observers found 90% (27/30) of the cancers in both groups. The
mean imaging quality scores were 2.1±0.9 for Group A, and 2.3±1.1 for Group B. The effective
mean doses were 6.59±0.59 mSv and 25.86±0.44 mSv for Groups A and B, respectively. Compared
with the control group (B), the imaging quality in the low-dose group decreased a little, but
the radiation dose substantially decreased by 74.6%.
Conclusion: The new DECT technique is valuable for examining gastric cancer patients. The dualkV
scan mode can substantially reduce radiation dose while preserving good diagnostic image