Aims and objectives
INTRODUCTION The principle of tomosynthesis was introduced in 1930 by Ziedses des Plantes. Full-Field digital mammography (FFDM) using digital detectors allows to develop this technique. In 2009,
digital mammograph with tomosynthesis equipment is put on the market. In 2013,
numerous studies proved its great interest in Breast Imaging. OBJECTIVES OF THE STUDY To estimate the dosimetry in Digital Breast Tomosynthesis using breast phantoms. To compare this dosimetry in 3D with 2D mammography. To...
Methods and materials
MATERIALS AND METHODS: MAMMOGRAPH Mammomat Inspiration® with tomosynthesis (Siemens,
Germany) DOSIMETRY Polymethacrylate de Methyle (PMMA) plates PIRAHNA dosimeter (RTI electronics,
Sweeden) PHANTOMS MTM 100 (Meditest,
France) BR3D (Meditest,
France) ACR RMI 156 (Siemens,
Germany) MAMMOGRAPH: MAMMOMAT INSPIRATION® WITH TOMOSYNTHESIS (fig.1) The scan angle in tomosynthesis is 50°. The tube makes a seesaw of 25° on both sides of the fixed target. An acquisition every 2...
1°) DOSYMETRY MEASURED BY THE PHYSICIST : IN 3D : MEASURE INCREASE : X2 There was a gap between the displayed dose delivered and the measured dose : maximum of 20%. There was a systematicunder estimation of the delivered dose showed by the machine. 2°) DELIVERED DOSES DEPENDING ON ACQUISITION MODE FOR EACH PHANTOM : Average in 2D 0,97 mGy. Average in 3D 2,01 mGy. Average in 2D+3D 2,98 mGy. Average in Combo mode 2,72 mGy. 2D Acquisition 3D Acquisition 2D+3D 3D Acquisition
COMBO mode fusion...
CONCLUSION Delivered doses in tomosynthesis are higher than in mammography. Phantoms MTM 100 and ACR-RMI-156 do not seem to be adaptedto the quality control in tomosynthesis. The phantom BR3D can be usedwhatevertickness. But the limit is an absence of score table,
which remains to be established.
Average glandular dose in digital mammography and breast tomosynthesis.
Rofo 2012 Oct;184(10):911-918. 2-Rafferty EA,
Assessing radiologist performance using combined digital mammography and breast tomosynthesis compared with digital mammography alone : results of a multicenter,
Radiology 2013 Jan; 266(1):104-113. 3-Per Skaane,