[The determination of the ovarian dosage in defecography on a digital C-arm unit].
When using defaecography as a radiological tool for diagnosing the anorectal function in female patients, the ovaries are inevitably directly exposed. With the aim of minimising the ovarian dose applied both the area-dose product and the surface dose above the ovaries were measured during investigations of female patients with a digital C-arm unit. These values were converted into ovarian doses using tissue-air ratios. From the surface dose measured with TLD-100 a mean ovarian dose of 15.6 +/- 8.6 mGy was derived. The contributions of screening and film exposures were similar. A reduction of screening time by 10 seconds or omission of 60 film exposures results in a decrease of ovarian dose by values between 0.7 and 2 mGy. Employing a greater focus-skin distance during defaecography, however, made it possible to reduce the ovarian dose by 26%.
Seifert
H
H
Universitätskliniken des Saarlandes, Institut für Radiologische Physik.
Blass
G
G
Leetz
H K
HK
Uhlmann
U
U
D001003:Anal Canal / Q000000981:diagnostic imaging*; D003672:Defecation; D005260:Female; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D008961:Models, Structural; D010053:Ovary / Q000528:radiation effects*; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D012007:Rectum / Q000000981:diagnostic imaging*; D013819:Thermoluminescent Dosimetry / Q000706:statistics & numerical data
Zur Bestimmung der Ovarialdosis bei der Defäkographie an einem digitalen C-Bogen.