Abstract
The performance of indirect-detection flat-panel imagers incorporating CsI:Tl x-ray converters is examined through calculation of the detective quantum efficiency (DQE) under conditions of chest radiography, fluoroscopy, and mammography. Calculations are based upon a cascaded systems model which has demonstrated excellent agreement with empirical signal, noise-power spectra, and DQE results. For each application, the DQE is calculated as a function of spatial-frequency and CsI:Tl thickness. A preliminary investigation into the optimization of flat-panel imaging systems is described, wherein the x-ray converter thickness which provides optimal DQE for a given imaging task is estimated. For each application, a number of example tasks involving detection of an object of variable size and contrast against a noisy background are considered. The method described is fairly general and can be extended to account for a variety of imaging tasks. For the specific examples considered, the preliminary results estimate optimal CsI:Tl thicknesses of ∼450 μm (∼200 mg/cm2), ∼320 μm (∼140 mg/cm2), and ∼200 μm (∼90 mg/cm2) for chest radiography, fluoroscopy, and mammography, respectively. These results are expected to depend upon the imaging task as well as upon the quality of available CsI:Tl, and furore improvements in scintillator fabrication could result in increased optimal thickness and DQE.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Editors | J.T. Dobbins III, J.M. Boone |
| Pages | 546-555 |
| Number of pages | 10 |
| Volume | 3336 |
| DOIs | |
| State | Published - 1998 |
| Externally published | Yes |
| Event | Medical Imaging 1998: Physics of Medical Imaging - San Diego, CA, United States Duration: Feb 22 1998 → Feb 24 1998 |
Other
| Other | Medical Imaging 1998: Physics of Medical Imaging |
|---|---|
| Country | United States |
| City | San Diego, CA |
| Period | 2/22/98 → 2/24/98 |
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Keywords
- Detective quantum efficiency
- Diagnostic x-ray imaging
- Flat-panel imagers
- Fluoroscopy
- Mammography
- Optimization
- Radiography
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
Cite this
DQE and system optimization for indirect-detection flat-panel imagers in diagnostic radiology. / Siewerdsen, Jeff; Antonuk, L. E.
Proceedings of SPIE - The International Society for Optical Engineering. ed. / J.T. Dobbins III; J.M. Boone. Vol. 3336 1998. p. 546-555.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - DQE and system optimization for indirect-detection flat-panel imagers in diagnostic radiology
AU - Siewerdsen, Jeff
AU - Antonuk, L. E.
PY - 1998
Y1 - 1998
N2 - The performance of indirect-detection flat-panel imagers incorporating CsI:Tl x-ray converters is examined through calculation of the detective quantum efficiency (DQE) under conditions of chest radiography, fluoroscopy, and mammography. Calculations are based upon a cascaded systems model which has demonstrated excellent agreement with empirical signal, noise-power spectra, and DQE results. For each application, the DQE is calculated as a function of spatial-frequency and CsI:Tl thickness. A preliminary investigation into the optimization of flat-panel imaging systems is described, wherein the x-ray converter thickness which provides optimal DQE for a given imaging task is estimated. For each application, a number of example tasks involving detection of an object of variable size and contrast against a noisy background are considered. The method described is fairly general and can be extended to account for a variety of imaging tasks. For the specific examples considered, the preliminary results estimate optimal CsI:Tl thicknesses of ∼450 μm (∼200 mg/cm2), ∼320 μm (∼140 mg/cm2), and ∼200 μm (∼90 mg/cm2) for chest radiography, fluoroscopy, and mammography, respectively. These results are expected to depend upon the imaging task as well as upon the quality of available CsI:Tl, and furore improvements in scintillator fabrication could result in increased optimal thickness and DQE.
AB - The performance of indirect-detection flat-panel imagers incorporating CsI:Tl x-ray converters is examined through calculation of the detective quantum efficiency (DQE) under conditions of chest radiography, fluoroscopy, and mammography. Calculations are based upon a cascaded systems model which has demonstrated excellent agreement with empirical signal, noise-power spectra, and DQE results. For each application, the DQE is calculated as a function of spatial-frequency and CsI:Tl thickness. A preliminary investigation into the optimization of flat-panel imaging systems is described, wherein the x-ray converter thickness which provides optimal DQE for a given imaging task is estimated. For each application, a number of example tasks involving detection of an object of variable size and contrast against a noisy background are considered. The method described is fairly general and can be extended to account for a variety of imaging tasks. For the specific examples considered, the preliminary results estimate optimal CsI:Tl thicknesses of ∼450 μm (∼200 mg/cm2), ∼320 μm (∼140 mg/cm2), and ∼200 μm (∼90 mg/cm2) for chest radiography, fluoroscopy, and mammography, respectively. These results are expected to depend upon the imaging task as well as upon the quality of available CsI:Tl, and furore improvements in scintillator fabrication could result in increased optimal thickness and DQE.
KW - Detective quantum efficiency
KW - Diagnostic x-ray imaging
KW - Flat-panel imagers
KW - Fluoroscopy
KW - Mammography
KW - Optimization
KW - Radiography
UR - http://www.scopus.com/inward/record.url?scp=0032404162&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032404162&partnerID=8YFLogxK
U2 - 10.1117/12.317057
DO - 10.1117/12.317057
M3 - Conference contribution
AN - SCOPUS:0032404162
VL - 3336
SP - 546
EP - 555
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Dobbins III, J.T.
A2 - Boone, J.M.
ER -