Physical characteristics of GE Senographe Essential and DS digital mammography detectors

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Medical Physics

DOI:https://doi.org/10.1118/1.2828185· OSTI ID:21036149

Ghetti, Caterina; Borrini, Adriano; Ortenzia, Ornella; Rossi, Raffaella; Ordonez, Pedro L ^[1]

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1. Azienda Ospedaliera di Parma, Parma (Italy)

The purpose of this study was to investigate physical characteristics of two full field digital mammography (FFDM) systems (GE Senographe Essential and DS). Both are indirect conversion (x ray to light) a-Si flat panels coupled with a CsI(Tl) scintillator. The examined systems have the same pixel size (100 {mu}m) but a different field of view: a conventional size 23x19.2 cm{sup 2} and a large field 24x30.7 cm{sup 2}, specifically designed to image large breasts. In the GE Senographe Essential model relevant improvements in flat panel design were implemented and new deposition tools for metal, a-Si, and CsI(Tl) were introduced by GE. These changes in detector design are expected to be beneficial for advanced applications such as breast tomosynthesis. The presampling modulation transfer function (MTF), normalized noise power spectrum (NNPS), and detective quantum efficiency (DQE) were measured for a wide range of exposure (25-240 {mu}Gy) with a RQA-M2 technique (28 kVp with a Mo/Mo target/filter combination and 2 mm of additional aluminum filtration). At 1, 2, and at 4 lp/mm MTF is equal to 0.9, 0.76, and 0.46 for the conventional field detector and to 0.85, 0.59, and 0.24 for the large field detector. The latter detector exhibits an improved NNPS due to a lower electronic noise and a better DQE that reaches 60%. In addition a contrast-detail analysis was performed with CDMAM 3.4 phantom and CDCOM software: GE Senographe DS showed statistically significant poorer detection ability in comparison with the GE Senographe Essential. These results could have been expected, at least qualitatively, considering the relative DQE of the two systems.

• OSTI ID: 21036149
• Journal Information: Medical Physics, Journal Name: Medical Physics Journal Issue: 2 Vol. 35; ISSN 0094-2405; ISSN MPHYA6
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
BIOMEDICAL RADIOGRAPHY
COMPUTER CODES
FILTRATION
IMAGE PROCESSING
MAMMARY GLANDS
NOISE
PHANTOMS
PHOSPHORS
QUANTUM EFFICIENCY
SCINTILLATION COUNTERS
SEMICONDUCTOR MATERIALS
TRANSFER FUNCTIONS
X RADIATION