Improved mammography with a reduced radiation dose.
A 2-cm-high focused air-interspaced grid with a 7:1 ratio and eight lamellae per inch was devised. The grid is arc-shaped and pivots on its focal point, the anode-cathode axis. Milliamperage was 35% less for breast phantom radiographs obtained with the new grid versus those obtained with a conventional 5:1 mammographic grid. In a comparison study of five mammograms, each evaluated for five parameters, the images obtained with the new grid were judged to be of equal or better quality than those obtained with a conventional grid in 17 of 20 comparisons.
Robinson
J D
JD
Department of Radiology, University of Minnesota Hospital and Clinic, Minneapolis 55455.
Ferlic
D
D
Kotula
F
F
Ferlic
L
L
Geise
R A
RA
Amplatz
K
K
D005260:Female; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000379:methods; D011829:Radiation Dosage