Radiation dose and image quality of high-pitch emergency abdominal CT in obese patients using third-generation dual-source CT (DSCT)

Forbrig, Robert; Ingrisch, Michael; Stahl, Robert; Winter, Katharina Stella; Reiser, Maximilian und Trumm, Christoph G. (2019): Radiation dose and image quality of high-pitch emergency abdominal CT in obese patients using third-generation dual-source CT (DSCT). In: Scientific Reports, Bd. 9, 15877

Abstract

In this third-generation dual-source CT (DSCT) study, we retrospectively investigated radiation dose and image quality of portal-venous high-pitch emergency CT in 60 patients (28 female, mean age 56 years) with a body mass index (BMI) (3) 30 kg/m(2). Patients were dichotomized in groups A (median BMI 31.5 kg/m(2);n = 33) and B (36.8 kg/m(2);n = 27). Volumetric CT dose index (CTDIvol), size-specific dose estimate (SSDE), dose length product (DLP) and effective dose (ED) were assessed. Contrast-to-noise ratio (CNR) and dose-independent figure-of-merit (FOM) CNR were calculated. Subjective image quality was assessed using a five-point scale. Mean values of CTDIvol, SSDE as well as normalized DLP and ED were 7.6 +/- 1.8 mGy, 8.0 +/- 1.8 mGy, 304 +/- 74 mGy * cm and 5.2 +/- 1.3 mSv for group A, and 12.6 +/- 3.7 mGy, 11.0 +/- 2.6 mGy, 521 +/- 157 mGy * cm and 8.9 +/- 2.7 mSv for group B (p < 0.001). CNR of the liver and spleen as well as each calculated FOM CNR were significantly higher in group A (p < 0.001). Subjective image quality was good in both groups. In conclusion, third-generation abdominal high-pitch emergency DSCT yields good image quality in obese patients. Radiation dose increases in patients with a BMI > 36.8 kg/m(2).

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 2045-2322
• Sprache: Englisch