Two-pass dual-energy CT imaging for simultaneous detection, characterization, and volume measurement of urinary stones with excretory-phase CT urography alone: a phantom study

作者：Takahashi Satoru^*; Itoh Toshihide; Niikawa Hidekazu; Shikata Atsushi; Murakami Emi; Tsunoda Hiroshi; Yoshioka Toshiaki; Tsujihata Masao; Yamamoto Hiroshi

来源：Japanese Journal of Radiology, 2013, 31(6): 393-400.

DOI：10.1007/s11604-013-0209-5

• Dual-energy CT
• 2-Material decomposition
• 3-Material decomposition
• Uric acid stone
• Two-pass dual-energy CT imaging

To evaluate if two-pass dual-energy CT imaging-i.e., simultaneous three-material and two-material decomposition analysis-can depict and characterize urinary stones in various concentrations of iodine solution in vitro. %26lt;br%26gt;Twelve urinary stones were scanned with a dual-source CT scanner. First, each stone (in a saline-filled tube) underwent single- and dual-energy mode CT scans in order to measure the volume of the stone. Each stone was then placed in various concentrations of contrast medium and scanned in dual-energy mode to calculate its volume via three-material decomposition analysis. Two-pass dual-energy CT imaging analysis software for the Matlab environment, which was developed specifically to process simultaneous three-material and two-material decomposition, was applied to characterize and calculate the volume of each stone. %26lt;br%26gt;Although the virtual non-contrast images from three-material decomposition analysis clearly visualized all of the stones in contrast medium with up to 80 mgI/mL, the volumes of the uric acid stones were overestimated. Two-pass dual-energy CT imaging was able to depict and characterize non-uric-acid stones in diluted contrast medium with up to 80 mgI/mL, whereas uric acid stones were correctly evaluated in diluted contrast medium with 40 mgI/mL or less. %26lt;br%26gt;Two-pass dual-energy CT imaging is able to depict and characterize urinary stones in contrast medium.

• 出版日期2013-6