15 KB184 KB13 KB199220252003Brnić, ZoranHebrang, AndrijaObad Kovačević, Dragicaštevilka:1letnik:374 stranistr. 5-8ISSN:1318-2099COBISSID:16231385URN:URN:NBN:SI:doc-PJVBDB0PenAssociation of Radiology and OncologyRadiology and oncology (Ljubljana)breastBreast DiseasesdiagnostikaDojka, boleznidojkeFilm DosimetryFilm, dozimetrijaMammographyMamografijaRadiation DosageRadiation MonitoringSevanje, doziranjeSevanje, monitorski nadzorTermoluminiscentna dozimetrijaThermoluminescent DosimetryMammographic oblique views 45° versus 60°| breast thickness, breast exposure and image quality|Background. Standard screening mammography includes two views: craniocaudal and mediolateral oblique. In the mediolateral oblique projection a central beam angle can varies between 30° and 60°. Patients and methods. We compare the thickness of the compressed breast, time-current product, exposures and image quality in two different mammographic oblique views: 45° versus 60°. Ourstudy population consisted of 33 women in whom additional 60° films after standard 45° films were obtained for the objective diagnostic reasons. Results. The mean thickness of the compressed breast was significantly lower with an angle of 60° than with an angle of 45° (47.8 vs. 50.7 mm, p<0.01); themean time current product and the mean breast exposure were significantly lower with an angle of 60° than with an angle of 45° (42.6 vs. 46.7 mAs, p<0.01; 0.67 vs. 0.78 mGy, p<0,01). The difference in the image quality has not reached statisticaI significance (but it exists!). Conclusions. By introducing 60° films instead of commonly used 45° films, mammograms of at least the same quality can be obtained with lower radiation dose, which is of great importance when we remind the great radiosensitivity of glandular breasttissueIzhodišča. Pri standardnem presejalnem testu z mamografijo uporabljamo dvoje projekcij: kraniokavdalno in mediolateralno polstransko. Pri mediolateralni polstranski projekciji je kot centralnega žarka od 30° do 60°. Bolniki in metode. Primerjali smo debelino komprimirane dojke, zmnožek časa in električnega toka, izpostavljenost sevanju in kakovost slik pri dveh različnihmamografskih poševnih projekcijah: pod kotoma 45° in 60°. Preiskave smo naredili pri 33 ženskah, pri katerih smo zaradi diagnostičnih zahtev polegslikanja pod kotom 45° naredili tudi slikanje pod kotom 60°. Rezultati. Srednja vrednost debeline komprimirane dojke je bila pri slikanju pod kotom 60° statistično značilno nižja kot pod kotom 45° (47,8 vs. 50,7 mm, p<0.01); pravtako sta bili tudi statistično značilno nižji srednji vrednosti zmnoška časa in eletričnega toka ter izpostavljenosti sevanju (42,6 vs. 46,7 mAs, p<0.01; 0,67 vs. 0,78 mGy, p<0.01). Našli smo tudi razliko v kakovosti slik, ki pa ni bila statistično značilno boljša. Zaključki. Z uporabo polstranske mamografske projekcije pod kotom 60°smo dosegli vsaj enako kakovost mamografskih slik ob nižji sevalni dozi, kar je zelo pomembno, saj je mlečna žleza v dojki zelo radiosenzitivnaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaDruštvo radiologije in onkologije