Comparison of image quality and mean absorbed dose to the breast for two mammographic films.
A film intended for mammography (Kodak SO 155 MRH-1) was tested and compared to one (Kodak SO 177 Ortho M) used earlier. Both films including the cassette could resolve 20 lp/mm. For a processing time of 90 s the new film gave the same overall image quality and irradiation dose to the breast as the old system. If, instead, the processing time was increased to 150 s, a 43% reduction in kerma could be attained with the new film. With a developing temperature of 36 degrees C and 150 s processing time, the noise is clinically acceptable. A nonparametric test showed no significant difference between the 2 films on the 0.01 level. At an X-ray tube potential difference of 25 kV, the mean absorbed dose to a 4.5-cm-thick breast was reduced from 1.7 mGy with the old combination to 1.0 mGy with the new one. The measurements were made with a moving grid.
Persliden
J
J
Department of Radiation Physics, Faculty of Health Sciences, Linköping University, Sweden.
Fransson
V
V
Vitak
B
B
Fagerberg
G
G
D006801:Humans; D008327:Mammography; D008961:Models, Structural; D011829:Radiation Dosage; D011874:Radiometry; D013696:Temperature; D014962:X-Ray Film