Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan

Jang Hwan Choi; Kerstin Muller; Scott Hsieh; Andreas Maier; Garry Gold; Marc Levenston; Rebecca Fahrig

doi:10.1117/12.2217347

Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan

Jang Hwan Choi, Kerstin Muller, Scott Hsieh, Andreas Maier, Garry Gold, Marc Levenston, Rebecca Fahrig

Radiology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

C-arm-based cone-beam CT (CBCT) systems with flat-panel detectors are suitable for diagnostic knee imaging due to their potentially flexible selection of CT trajectories and wide volumetric beam coverage. In knee CT imaging, over-exposure artifacts can occur because of limitations in the dynamic range of the flat panel detectors present on most CBCT systems. We developed a straightforward but effective method for correction and detection of over-exposure for an Automatic Exposure Control (AEC)-enabled standard knee scan incorporating a prior low dose scan. The radiation dose associated with the low dose scan was negligible (0.0042mSv, 2.8% increase) which was enabled by partially sampling the projection images considering the geometry of the knees and lowering the dose further to be able to just see the skin-air interface. We combined the line integrals from the AEC and low dose scans after detecting over-exposed regions by comparing the line profiles of the two scans detector row-wise. The combined line integrals were reconstructed into a volumetric image using filtered back projection. We evaluated our method using in vivo human subject knee data. The proposed method effectively corrected and detected over-exposure, and thus recovered the visibility of exterior tissues (e.g., the shape and density of the patella, and the patellar tendon), incorporating a prior low dose scan with a negligible increase in radiation exposure.

Original language	English (US)
Title of host publication	Medical Imaging 2016
Subtitle of host publication	Physics of Medical Imaging
Editors	Despina Kontos, Joseph Y. Lo, Thomas G. Flohr
Publisher	SPIE
ISBN (Electronic)	9781510600188
DOIs	https://doi.org/10.1117/12.2217347
State	Published - 2016
Event	Medical Imaging 2016: Physics of Medical Imaging - San Diego, United States Duration: Feb 28 2016 → Mar 2 2016

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	9783
ISSN (Print)	1605-7422

Other

Other	Medical Imaging 2016: Physics of Medical Imaging
Country/Territory	United States
City	San Diego
Period	2/28/16 → 3/2/16

Keywords

Automatic Exposure Control
C-arm CT
Cone-beam CT
Detector over-exposure
Detector saturation
Flat-panel detector
Knee CT imaging
Lower extremity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Biomaterials
Radiology Nuclear Medicine and imaging

Access to Document

10.1117/12.2217347

Cite this

Choi, J. H., Muller, K., Hsieh, S., Maier, A., Gold, G., Levenston, M., & Fahrig, R. (2016). Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan. In D. Kontos, J. Y. Lo, & T. G. Flohr (Eds.), Medical Imaging 2016: Physics of Medical Imaging Article 97830L (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9783). SPIE. https://doi.org/10.1117/12.2217347

Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan. / Choi, Jang Hwan; Muller, Kerstin; Hsieh, Scott et al.
Medical Imaging 2016: Physics of Medical Imaging. ed. / Despina Kontos; Joseph Y. Lo; Thomas G. Flohr. SPIE, 2016. 97830L (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9783).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Choi, JH, Muller, K, Hsieh, S, Maier, A, Gold, G, Levenston, M & Fahrig, R 2016, Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan. in D Kontos, JY Lo & TG Flohr (eds), Medical Imaging 2016: Physics of Medical Imaging., 97830L, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 9783, SPIE, Medical Imaging 2016: Physics of Medical Imaging, San Diego, United States, 2/28/16. https://doi.org/10.1117/12.2217347

Choi JH, Muller K, Hsieh S, Maier A, Gold G, Levenston M et al. Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan. In Kontos D, Lo JY, Flohr TG, editors, Medical Imaging 2016: Physics of Medical Imaging. SPIE. 2016. 97830L. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). doi: 10.1117/12.2217347

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abstract = "C-arm-based cone-beam CT (CBCT) systems with flat-panel detectors are suitable for diagnostic knee imaging due to their potentially flexible selection of CT trajectories and wide volumetric beam coverage. In knee CT imaging, over-exposure artifacts can occur because of limitations in the dynamic range of the flat panel detectors present on most CBCT systems. We developed a straightforward but effective method for correction and detection of over-exposure for an Automatic Exposure Control (AEC)-enabled standard knee scan incorporating a prior low dose scan. The radiation dose associated with the low dose scan was negligible (0.0042mSv, 2.8% increase) which was enabled by partially sampling the projection images considering the geometry of the knees and lowering the dose further to be able to just see the skin-air interface. We combined the line integrals from the AEC and low dose scans after detecting over-exposed regions by comparing the line profiles of the two scans detector row-wise. The combined line integrals were reconstructed into a volumetric image using filtered back projection. We evaluated our method using in vivo human subject knee data. The proposed method effectively corrected and detected over-exposure, and thus recovered the visibility of exterior tissues (e.g., the shape and density of the patella, and the patellar tendon), incorporating a prior low dose scan with a negligible increase in radiation exposure.",

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AU - Choi, Jang Hwan

AU - Muller, Kerstin

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AU - Maier, Andreas

AU - Gold, Garry

AU - Levenston, Marc

AU - Fahrig, Rebecca

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N2 - C-arm-based cone-beam CT (CBCT) systems with flat-panel detectors are suitable for diagnostic knee imaging due to their potentially flexible selection of CT trajectories and wide volumetric beam coverage. In knee CT imaging, over-exposure artifacts can occur because of limitations in the dynamic range of the flat panel detectors present on most CBCT systems. We developed a straightforward but effective method for correction and detection of over-exposure for an Automatic Exposure Control (AEC)-enabled standard knee scan incorporating a prior low dose scan. The radiation dose associated with the low dose scan was negligible (0.0042mSv, 2.8% increase) which was enabled by partially sampling the projection images considering the geometry of the knees and lowering the dose further to be able to just see the skin-air interface. We combined the line integrals from the AEC and low dose scans after detecting over-exposed regions by comparing the line profiles of the two scans detector row-wise. The combined line integrals were reconstructed into a volumetric image using filtered back projection. We evaluated our method using in vivo human subject knee data. The proposed method effectively corrected and detected over-exposure, and thus recovered the visibility of exterior tissues (e.g., the shape and density of the patella, and the patellar tendon), incorporating a prior low dose scan with a negligible increase in radiation exposure.

AB - C-arm-based cone-beam CT (CBCT) systems with flat-panel detectors are suitable for diagnostic knee imaging due to their potentially flexible selection of CT trajectories and wide volumetric beam coverage. In knee CT imaging, over-exposure artifacts can occur because of limitations in the dynamic range of the flat panel detectors present on most CBCT systems. We developed a straightforward but effective method for correction and detection of over-exposure for an Automatic Exposure Control (AEC)-enabled standard knee scan incorporating a prior low dose scan. The radiation dose associated with the low dose scan was negligible (0.0042mSv, 2.8% increase) which was enabled by partially sampling the projection images considering the geometry of the knees and lowering the dose further to be able to just see the skin-air interface. We combined the line integrals from the AEC and low dose scans after detecting over-exposed regions by comparing the line profiles of the two scans detector row-wise. The combined line integrals were reconstructed into a volumetric image using filtered back projection. We evaluated our method using in vivo human subject knee data. The proposed method effectively corrected and detected over-exposure, and thus recovered the visibility of exterior tissues (e.g., the shape and density of the patella, and the patellar tendon), incorporating a prior low dose scan with a negligible increase in radiation exposure.

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KW - C-arm CT

KW - Cone-beam CT

KW - Detector over-exposure

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Over-exposure correction in knee cone-beam CT imaging with automatic exposure control using a partial low dose scan

Abstract

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