SU‐GG‐I‐130

An Evaluation of Image Quality and Dose for a Hologic Selenia Digital Mammography System with a Tungsten Anode X‐Ray Tube

B. Schueler, K. Fetterly

Research output: Contribution to journalArticle

Abstract

Purpose: Image quality and breast dose for an amorphous selenium detector digital mammography system with a tungsten (W) anode x‐ray tube and rhodium (Rh) and silver (Ag) filters were compared to an equivalent model system with a molybdenum (Mo) anode x‐ray tube and Mo and Rh filters. Method and Materials: Signal difference to noise ratio (SDNR) and mean glandular dose (MGD) were measured for 4, 6 and 8‐cm thick breast equivalent material slabs and an aluminum contrast object. Values were compared over a range of kVp and mAs selections for Mo/Mo, Mo/Rh, W/Rh and W/Ag anode/filter combinations. The kVp selection that resulted in the highest SDNR for each thickness and anode/filter combination was determined. SDNR at the optimum kVp for each anode/filter was then compared. The automatic exposure control (AEC) selections for the W and Mo system were also compared with regards to SDNR and MGD. Results: W/Rh was found to produce the highest SDNR over a wide MGD range, followed by W/Ag, Mo/Rh and Mo/Mo. The W anode system provided a 30–35% improvement in SDNR for the same breast dose as compared to the Mo anode system. When the SDNR of the W anode and M anode systems are matched, the W anode system resulted in a 40–50% reduction in MGD. Using the W anode system default AEC for selection of exposure parameters, a 7–25% improvement in SDNR and a 10–30% reduction in MGD was achieved, as compared to the Mo anode system. Conclusion: The W anode system provides superior image quality for the same breast dose. The default AEC for this system provides a compromise between image quality improvement and decreased dose as compared to the Mo anode system.

Original languageEnglish (US)
Pages (from-to)2672
Number of pages1
JournalMedical Physics
Volume35
Issue number6
DOIs
StatePublished - 2008

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Tungsten
Mammography
Selenium
Molybdenum
Electrodes
X-Rays
Signal-To-Noise Ratio
Rhodium
Breast
Quality Improvement
Aluminum
Silver

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

SU‐GG‐I‐130 : An Evaluation of Image Quality and Dose for a Hologic Selenia Digital Mammography System with a Tungsten Anode X‐Ray Tube. / Schueler, B.; Fetterly, K.

In: Medical Physics, Vol. 35, No. 6, 2008, p. 2672.

Research output: Contribution to journalArticle

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abstract = "Purpose: Image quality and breast dose for an amorphous selenium detector digital mammography system with a tungsten (W) anode x‐ray tube and rhodium (Rh) and silver (Ag) filters were compared to an equivalent model system with a molybdenum (Mo) anode x‐ray tube and Mo and Rh filters. Method and Materials: Signal difference to noise ratio (SDNR) and mean glandular dose (MGD) were measured for 4, 6 and 8‐cm thick breast equivalent material slabs and an aluminum contrast object. Values were compared over a range of kVp and mAs selections for Mo/Mo, Mo/Rh, W/Rh and W/Ag anode/filter combinations. The kVp selection that resulted in the highest SDNR for each thickness and anode/filter combination was determined. SDNR at the optimum kVp for each anode/filter was then compared. The automatic exposure control (AEC) selections for the W and Mo system were also compared with regards to SDNR and MGD. Results: W/Rh was found to produce the highest SDNR over a wide MGD range, followed by W/Ag, Mo/Rh and Mo/Mo. The W anode system provided a 30–35{\%} improvement in SDNR for the same breast dose as compared to the Mo anode system. When the SDNR of the W anode and M anode systems are matched, the W anode system resulted in a 40–50{\%} reduction in MGD. Using the W anode system default AEC for selection of exposure parameters, a 7–25{\%} improvement in SDNR and a 10–30{\%} reduction in MGD was achieved, as compared to the Mo anode system. Conclusion: The W anode system provides superior image quality for the same breast dose. The default AEC for this system provides a compromise between image quality improvement and decreased dose as compared to the Mo anode system.",
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