A Phantom Study of 100 kVp Spectral Data Accuracy Using Iodine Density in Dual-Layer Detector CT

Abstract

In certain diseases, it can be challenging to differentiate tissues based solely on the HU value. The HU value differs depending on factors such as the patient's body type, CT equipment, and testing conditions. Accordingly, iodine density evaluation is being used as a new diagnostic criterion for CT images. The study was conducted to evaluate the accuracy of the 7500 spectral data that can be obtained even at 100 kVp. It cited iodine density as one of the IQon CT spectral data that could only be obtained at 120 kVp or higher. The iodine density comparison between the 7500 CT and IQon CT was measured within the error range. This was also observed in comparison experiments and collimator change experiments with 100 kVp. As a result of the study, the accuracy of 100 kVp was confirmed, and the CTDI was reduced by 10%. Additionally, when measuring iodine density, it was found that the minimum dose had a significant value, with a reduction of 40%. It is believed that a protocol that reduces CTDIvol by approximately 40% at 100 kVp can be utilized in clinical trials for children and patients with a low body mass index.