[Comparing the visualization of microcalcifications with direct magnification in digital full-field mammography vs. film-screen mammography].
OBJECTIVE
To evaluate the conspicuity of microcalcifications in magnified mammographic views of preparations obtained with full field digital mammography (FFDM), film-screen mammography (FSM), and the DIMA technique.


METHODS
Twelve preparations were examined by FFDM and FSM using 1.8 x magnification and DIMA using 7 x magnification. Parameter settings were identical for all three techniques. The number of visible microcalcifications was then determined for each modality by three radiologists. As far as possible, all preparations were X-rayed at 22 kV and 10 mAS.


RESULTS
Altogether 9705 calcifications were counted (DIMA: 1609/1542/1534; FFDM: 1020/753/881; FSM: 901/643/822). The total number of microcalcifications identified with the DIMA technique was 4685 as compared to 2654 with FFDM and 2366 with FSM. The calcifications counted with FFDM and FSM thus corresponded to 56.6 % and 50.5 %, respectively, of those identified with DIMA. The differences between the groups were statistically significant (F-Test, p < 0.05).


CONCLUSIONS
Significantly more calcifications are identified when magnified mammographic views of preparations containing microcalcifications are obtained with the DIMA technique compared to FFDM or FSM. FFDM depicts markedly more calcifications than FSM. This means one should increase spatial resolution. Digital mammography offers the potential for improved visualization of microcalcifications with advanced applications.
Diekmann
F
F
Institut für Radiologie, Universitätsklinikum Charité, Berlin, Germany. felix.diekmann@charite.de
Diekmann
S
S
Bick
U
U
Rogalla
P
P
Blohmer
J U
JU
Winzer
K J
KJ
Hamm
B
B
D001943:Breast Neoplasms / Q000000981:diagnostic imaging*; D002114:Calcinosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008327:Mammography; D011856:Radiographic Image Enhancement; D011858:Radiographic Magnification; D012680:Sensitivity and Specificity; D013382:Subtraction Technique; D014963:X-Ray Intensifying Screens