Sungwon Lee1, Seung Eun Jung, Sung Eun Rha, Jae Young Byun. 1. Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul 137-701, Republic of Korea. sungwonlee8@gmail.com
Abstract
OBJECTIVE: To compare 128-slice multidetector computed tomography (MDCT) at 100kVp and 120kVp for image quality and radiation dose. MATERIALS AND METHODS: Our study had approval of our institutional review board. We retrospectively selected 25 patients who underwent CT urography for the evaluation of hematuria. The CT scans were taken with 128-slice MDCT, with three phases (precontrast, nephrographic, and excretory), using an automatic tube current modulation with reference tube level of 180mAs and tube voltages of either 100kVp (n=14, mean age 26.71) or 120kVp (n=11, mean age 25.54). The signal-to-noise-ratio (SNR) and contrast-to-noise-ratio (CNR) of the urinary tract, the subjective image quality of the urinary tract evaluated with a five point scale by two radiologists and the effective dose calculated on the basis of dose-length-product (DLP) and volume-CT-dose-index (CTDIvol) were compared between the groups with Student's t test or Mann-Whitney U test. RESULTS: There was no significant difference in the SNR (p=0.358), CNR (p=0.303) and the subjective image quality (p=0.486) between the two protocols. The mean CTDIvol, DLP and the effective dose in the 100kVp protocol were significantly lower than the 120kVp protocol (p=0.000, 0.000). CONCLUSION: CT urography using 100kVp protocol resulted in reduction of radiation dose without loss of objective or subjective image quality.
OBJECTIVE: To compare 128-slice multidetector computed tomography (MDCT) at 100kVp and 120kVp for image quality and radiation dose. MATERIALS AND METHODS: Our study had approval of our institutional review board. We retrospectively selected 25 patients who underwent CT urography for the evaluation of hematuria. The CT scans were taken with 128-slice MDCT, with three phases (precontrast, nephrographic, and excretory), using an automatic tube current modulation with reference tube level of 180mAs and tube voltages of either 100kVp (n=14, mean age 26.71) or 120kVp (n=11, mean age 25.54). The signal-to-noise-ratio (SNR) and contrast-to-noise-ratio (CNR) of the urinary tract, the subjective image quality of the urinary tract evaluated with a five point scale by two radiologists and the effective dose calculated on the basis of dose-length-product (DLP) and volume-CT-dose-index (CTDIvol) were compared between the groups with Student's t test or Mann-Whitney U test. RESULTS: There was no significant difference in the SNR (p=0.358), CNR (p=0.303) and the subjective image quality (p=0.486) between the two protocols. The mean CTDIvol, DLP and the effective dose in the 100kVp protocol were significantly lower than the 120kVp protocol (p=0.000, 0.000). CONCLUSION: CT urography using 100kVp protocol resulted in reduction of radiation dose without loss of objective or subjective image quality.
Authors: Leon Will; Frederik L Giesel; Martin T Freitag; Anne K Berger; Walter Mier; Klaus Kopka; Stefan A Koerber; Hendrik Rathke; Christophe Kremer; Clemens Kratochwil; Hans-Ulrich Kauczor; Uwe Haberkorn; Tim F Weber Journal: Cancer Imaging Date: 2017-12-20 Impact factor: 3.909
Authors: Przemysław Bombiński; Michał Brzewski; Stanisław Warchoł; Agnieszka Biejat; Marcin Banasiuk; Marek Gołębiowski Journal: Pol J Radiol Date: 2018-04-27
Authors: Przemysław Bombiński; Michał Brzewski; Stanislaw Warchol; Agnieszka Biejat; Marcin Banasiuk; Marek Gołębiowski Journal: Cent European J Urol Date: 2018-12-27