Image Quality and Radiation Dose Assessment of a Digital Mammography System

Journal Article · Wed Jul 07 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3469689· OSTI ID:21410542

Isa, N M; Othman, F ^[1]; Ramli, A A. M. ^[2]

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1. Department of Diagnostic Imaging, Hospital Putrajaya, Pres, 62250 Putrajaya, Walayah Persekutuan (Malaysia)
2. Malaysian Nuclear Agency, 43000 Kajang, Selangor (Malaysia)

Image quality and radiation dose of a direct amorphous selenium digital mammography system were considered in terms of contrast to noise ratio (CNR) and average glandular dose (AGD). They were measured for various qualities and breast phantom thicknesses with different types of breast tissue composition to determine optimal radiation quality and dose. Three sets of breast tissue equivalent slabs (30%:70%, 50%:50% and 70%:30% glandular-adipose) with thickness of 2 cm to 7 cm and 0.2 mm aluminum foil were used to provide certain CNR. Two different combinations of anode/ilter material and a wide range of tube voltages were employed for each phantom thickness. Phantom images with grid were acquired using automatic exposure control (AEC) mode for each thickness. Phantom images without grid were also obtained in manual exposure mode by selecting the same anode/filter combination and kVp as the image obtained with grid at the same thickness, but varying mAs of 10 to 200 mAs. Optimization indicated that relatively high energy beam qualities should be used with a greater dose to compensate for lower energy x-rays. The results also indicate that current AEC setting for a fixed detector is not optimal.

• OSTI ID: 21410542
• Journal Information: AIP Conference Proceedings, Vol. 1250, Issue 1; Conference: PERFIK2009: National physics conference 2009, Malacca (Malaysia), 7-9 Dec 2009; Other Information: DOI: 10.1063/1.3469689; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS
AMORPHOUS STATE
BEAMS
BIOMEDICAL RADIOGRAPHY
CHARGES
ELECTRIC POTENTIAL
IMAGE PROCESSING
IMAGES
MAMMARY GLANDS
NOISE
OPTIMIZATION
PHANTOMS
RADIATION DOSES
RADIATION QUALITY
SELENIUM
THICKNESS
X RADIATION
BODY
DIAGNOSTIC TECHNIQUES
DIMENSIONS
DOSES
ELECTROMAGNETIC RADIATION
ELEMENTS
GLANDS
IONIZING RADIATIONS
MEDICINE
MOCKUP
NUCLEAR MEDICINE
ORGANS
PROCESSING
RADIATIONS
RADIOLOGY
SEMIMETALS
STRUCTURAL MODELS