Kazumi Araki1, Takeshi Yoshizako2, Rika Yoshida1, Keiji Tada3, Hajime Kitagaki1. 1. Department of Radiology, Shimane University Faculty of Medicine, P.O. Box 00693-8501, 89-1 Enyacho, Izumo, Japan. 2. Department of Radiology, Shimane University Faculty of Medicine, P.O. Box 00693-8501, 89-1 Enyacho, Izumo, Japan. Electronic address: yosizako@med.shimane-u.ac.jp. 3. Department of Radiology, Shimane University Hospital, P.O. Box 00693-8501, 89-1 Enyacho, Izumo, Japan.
Abstract
PURPOSE: The purpose of this study was to evaluate the quality of image in abdominopelvic late phase computed tomography (CT) with a low tube voltage plus low dose contrast medium (CM) protocol (80-kVp, 60% CM). A compared with the conventional protocol (120-kVp, 100% CM) B in the same patients. MATERIAL AND METHODS: This study included with 22 patients {36 to 77 kg (mean: 55.5 kg)} who had renal insufficiency and had experience of performance conventional CT without renal insufficiency during pre-18 months. The CT value of the portal vein, liver parenchyma, abdominal aorta, psoas muscle was measured. The estimated mean CNR (contrast-to-noise ratios), FOM (figure of merit), DLP (dose length product) and ED (effective dose) were compared between protocol A and B. Moreover, two radiologists assessed the visual quality of the CT images. RESULTS: The mean DLP and ED in the protocol B was about 50% lower than that in the protocol A (p < 0.01). The mean CT value of the portal vein and abdominal aorta in the protocol B were significantly higher than that in the protocol A (p < 0.01). All of the FOM in the protocol B was significantly higher than that in the protocol A (p < 0.01). However, there was no significant difference in the mean CNR and visual quality between protocol A and B. CONCLUSION: Performance of abdominopelvic CT using a low tube voltage plus reduced CM dose (80-kVp, 60% CM) achieved reduction of the radiation dose without impairing image quality in relatively light weight group. CLINICAL RELEVANCE/APPLICATION: In abdominopelvic CT, protocol of low tube voltage (80-kVp) plus iodine dose reduction (60%) is able to provide the same quality of traditional protocols, also able to reducing radiation exposure (50%).
PURPOSE: The purpose of this study was to evaluate the quality of image in abdominopelvic late phase computed tomography (CT) with a low tube voltage plus low dose contrast medium (CM) protocol (80-kVp, 60% CM). A compared with the conventional protocol (120-kVp, 100% CM) B in the same patients. MATERIAL AND METHODS: This study included with 22 patients {36 to 77 kg (mean: 55.5 kg)} who had renal insufficiency and had experience of performance conventional CT without renal insufficiency during pre-18 months. The CT value of the portal vein, liver parenchyma, abdominal aorta, psoas muscle was measured. The estimated mean CNR (contrast-to-noise ratios), FOM (figure of merit), DLP (dose length product) and ED (effective dose) were compared between protocol A and B. Moreover, two radiologists assessed the visual quality of the CT images. RESULTS: The mean DLP and ED in the protocol B was about 50% lower than that in the protocol A (p < 0.01). The mean CT value of the portal vein and abdominal aorta in the protocol B were significantly higher than that in the protocol A (p < 0.01). All of the FOM in the protocol B was significantly higher than that in the protocol A (p < 0.01). However, there was no significant difference in the mean CNR and visual quality between protocol A and B. CONCLUSION: Performance of abdominopelvic CT using a low tube voltage plus reduced CM dose (80-kVp, 60% CM) achieved reduction of the radiation dose without impairing image quality in relatively light weight group. CLINICAL RELEVANCE/APPLICATION: In abdominopelvic CT, protocol of low tube voltage (80-kVp) plus iodine dose reduction (60%) is able to provide the same quality of traditional protocols, also able to reducing radiation exposure (50%).
Authors: Bibi Martens; Joris G A Bosschee; Sander M J Van Kuijk; Cécile R L P N Jeukens; Maikel T H Brauer; Joachim E Wildberger; Casper Mihl Journal: PLoS One Date: 2022-04-07 Impact factor: 3.240
Authors: Laura Cosmai; Camillo Porta; Carmelo Privitera; Loreto Gesualdo; Giuseppe Procopio; Stefania Gori; Andrea Laghi Journal: ESMO Open Date: 2020-03