Abstract
An experimental measurement technique that directly measures the magnitude and spatial distribution of scatter in relation to primary radiation is presented in this work. The technique involves the acquisition of magnified edge spread function (ESF) images with and without scattering material present. The ESFs are normalized and subtracted to yield scatter-to- primary ratios (SPRs), along with the spatial distributions of scatter and primary radiation. Mammography is used as the modality to demonstrate the ESF method, which is applicable to all radiographic environments. Sets of three images were acquired with a modified clinical mammography system employing a flat panel detector for 2, 4, 6, and 8 cm thick breast tissue equivalent material phantoms composed of 0%, 43%, and 100% glandular tissue at four different kV settings. Beam stop measurements of scatter were used to validate the ESF methodology. There was good agreement of the mean SPRs between the beam stop and ESF methods. There was good precision in the ESF- determined SPRs with a coefficient of variation on the order of 5%. SPRs ranged from 0.2 to 2.0 and were effectively independent of energy for clinically realistic kVps. The measured SPRs for 2, 4, and 6 cm 0% glandular phantoms imaged at 28 kV were 0.21 ± 0.01, 0.39 ± 0.01, and 0.57 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 43% glandular phantoms imaged at 28 kV were 0.20 ± 0.01, 0.35 ± 0.02, and 0.53 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 100% glandular phantoms imaged at 28 kV were 0.22 ± 0.02, 0.42 ± 0.03, and 0.88 ± 0.08, respectively. (C) 2000 American Association of Physicists in Medicine.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 845-853 |
| Number of pages | 9 |
| Journal | Medical Physics |
| Volume | 27 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2000 |
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Keywords
- Catter-to-primary ratio (SPR)
- Edge spread function (ESF)
- Mammography
- Measurement technique
- Scatter
ASJC Scopus subject areas
- Biophysics
Cite this
An edge spread technique for measurement of the scatter-to-primary ratio in mammography. / Cooper, Virgil N.; Boone, John M; Seibert, J Anthony; Pellot-Barakat, Claire J.
In: Medical Physics, Vol. 27, No. 5, 05.2000, p. 845-853.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An edge spread technique for measurement of the scatter-to-primary ratio in mammography
AU - Cooper, Virgil N.
AU - Boone, John M
AU - Seibert, J Anthony
AU - Pellot-Barakat, Claire J.
PY - 2000/5
Y1 - 2000/5
N2 - An experimental measurement technique that directly measures the magnitude and spatial distribution of scatter in relation to primary radiation is presented in this work. The technique involves the acquisition of magnified edge spread function (ESF) images with and without scattering material present. The ESFs are normalized and subtracted to yield scatter-to- primary ratios (SPRs), along with the spatial distributions of scatter and primary radiation. Mammography is used as the modality to demonstrate the ESF method, which is applicable to all radiographic environments. Sets of three images were acquired with a modified clinical mammography system employing a flat panel detector for 2, 4, 6, and 8 cm thick breast tissue equivalent material phantoms composed of 0%, 43%, and 100% glandular tissue at four different kV settings. Beam stop measurements of scatter were used to validate the ESF methodology. There was good agreement of the mean SPRs between the beam stop and ESF methods. There was good precision in the ESF- determined SPRs with a coefficient of variation on the order of 5%. SPRs ranged from 0.2 to 2.0 and were effectively independent of energy for clinically realistic kVps. The measured SPRs for 2, 4, and 6 cm 0% glandular phantoms imaged at 28 kV were 0.21 ± 0.01, 0.39 ± 0.01, and 0.57 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 43% glandular phantoms imaged at 28 kV were 0.20 ± 0.01, 0.35 ± 0.02, and 0.53 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 100% glandular phantoms imaged at 28 kV were 0.22 ± 0.02, 0.42 ± 0.03, and 0.88 ± 0.08, respectively. (C) 2000 American Association of Physicists in Medicine.
AB - An experimental measurement technique that directly measures the magnitude and spatial distribution of scatter in relation to primary radiation is presented in this work. The technique involves the acquisition of magnified edge spread function (ESF) images with and without scattering material present. The ESFs are normalized and subtracted to yield scatter-to- primary ratios (SPRs), along with the spatial distributions of scatter and primary radiation. Mammography is used as the modality to demonstrate the ESF method, which is applicable to all radiographic environments. Sets of three images were acquired with a modified clinical mammography system employing a flat panel detector for 2, 4, 6, and 8 cm thick breast tissue equivalent material phantoms composed of 0%, 43%, and 100% glandular tissue at four different kV settings. Beam stop measurements of scatter were used to validate the ESF methodology. There was good agreement of the mean SPRs between the beam stop and ESF methods. There was good precision in the ESF- determined SPRs with a coefficient of variation on the order of 5%. SPRs ranged from 0.2 to 2.0 and were effectively independent of energy for clinically realistic kVps. The measured SPRs for 2, 4, and 6 cm 0% glandular phantoms imaged at 28 kV were 0.21 ± 0.01, 0.39 ± 0.01, and 0.57 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 43% glandular phantoms imaged at 28 kV were 0.20 ± 0.01, 0.35 ± 0.02, and 0.53 ± 0.02, respectively. The measured SPRs for 2, 4, and 6 cm 100% glandular phantoms imaged at 28 kV were 0.22 ± 0.02, 0.42 ± 0.03, and 0.88 ± 0.08, respectively. (C) 2000 American Association of Physicists in Medicine.
KW - Catter-to-primary ratio (SPR)
KW - Edge spread function (ESF)
KW - Mammography
KW - Measurement technique
KW - Scatter
UR - http://www.scopus.com/inward/record.url?scp=0034111936&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034111936&partnerID=8YFLogxK
U2 - 10.1118/1.598950
DO - 10.1118/1.598950
M3 - Article
C2 - 10841386
AN - SCOPUS:0034111936
VL - 27
SP - 845
EP - 853
JO - Medical Physics
JF - Medical Physics
SN - 0094-2405
IS - 5
ER -