Technical Note: kV‐independent coronary calcium scoring: A phantom evaluation of score accuracy and potential radiation dose reduction. Issue 3 (9th January 2021)
- Record Type:
- Journal Article
- Title:
- Technical Note: kV‐independent coronary calcium scoring: A phantom evaluation of score accuracy and potential radiation dose reduction. Issue 3 (9th January 2021)
- Main Title:
- Technical Note: kV‐independent coronary calcium scoring: A phantom evaluation of score accuracy and potential radiation dose reduction
- Authors:
- Tao, Shengzhen
Sheedy, Emily
Bruesewitz, Michael
Weber, Nikkole
Williams, Kyle
Halaweish, Ahmed
Schmidt, Bernhard
Williamson, Eric
McCollough, Cynthia
Leng, Shuai - Abstract:
- Abstract : Purpose: To determine the accuracy of CT number and calcium score of a kV‐independent technique based on an artificial 120 kV reconstruction, and its potential to reduce radiation dose. Methods: Anthropomorphic chest phantoms were scanned on a third‐generation dual‐source CT system equipped with the artificial 120 kV reconstruction. First, a phantom module containing a 20‐mm diameter hydroxyapatite (HA) insert was scanned inside the chest phantoms at different tube potentials (70–140 kV) to evaluate calcium CT number accuracy. Next, three small HA inserts (diameter/length = 5 mm) were inserted into a pork steak and scanned inside the phantoms to evaluate calcium score accuracy at different kVs. Finally, the same setup was scanned using automatic exposure control (AEC) at 120 kV, and then with automatic kV selection (auto‐kV). Phantoms were also scanned at 120 kV using a size‐dependent mA chart. CT numbers of soft tissue and calcium were measured from different kV images. Calcium score of each small HA insert was measured using commercial software. Results: The CT number difference from 120 kV was small with tube potentials from 90 to 140 kV for both soft tissue and calcium (maximal difference of 4/5 HU, respectively). Consistent calcium scores were obtained from images of different kVs compared to 120 kV, with a relative difference <8%. Auto‐kV provided a 25–34% dose reduction compared to AEC alone. Conclusion: A kV‐independent calcium scoring technique canAbstract : Purpose: To determine the accuracy of CT number and calcium score of a kV‐independent technique based on an artificial 120 kV reconstruction, and its potential to reduce radiation dose. Methods: Anthropomorphic chest phantoms were scanned on a third‐generation dual‐source CT system equipped with the artificial 120 kV reconstruction. First, a phantom module containing a 20‐mm diameter hydroxyapatite (HA) insert was scanned inside the chest phantoms at different tube potentials (70–140 kV) to evaluate calcium CT number accuracy. Next, three small HA inserts (diameter/length = 5 mm) were inserted into a pork steak and scanned inside the phantoms to evaluate calcium score accuracy at different kVs. Finally, the same setup was scanned using automatic exposure control (AEC) at 120 kV, and then with automatic kV selection (auto‐kV). Phantoms were also scanned at 120 kV using a size‐dependent mA chart. CT numbers of soft tissue and calcium were measured from different kV images. Calcium score of each small HA insert was measured using commercial software. Results: The CT number difference from 120 kV was small with tube potentials from 90 to 140 kV for both soft tissue and calcium (maximal difference of 4/5 HU, respectively). Consistent calcium scores were obtained from images of different kVs compared to 120 kV, with a relative difference <8%. Auto‐kV provided a 25–34% dose reduction compared to AEC alone. Conclusion: A kV‐independent calcium scoring technique can produce artificial 120 kV images with consistent soft tissue and calcium CT numbers compared to standard 120 kV examinations. When coupled with auto‐kV, this technique can reduce radiation by 25–34% compared to that with AEC alone, while providing consistent calcium scores as that of standard 120 kV examinations. … (more)
- Is Part Of:
- Medical physics. Volume 48:Issue 3(2021)
- Journal:
- Medical physics
- Issue:
- Volume 48:Issue 3(2021)
- Issue Display:
- Volume 48, Issue 3 (2021)
- Year:
- 2021
- Volume:
- 48
- Issue:
- 3
- Issue Sort Value:
- 2021-0048-0003-0000
- Page Start:
- 1307
- Page End:
- 1314
- Publication Date:
- 2021-01-09
- Subjects:
- Agatston score -- automatic exposure control -- calcium score -- cardiac CT -- dose reduction
Medical physics -- Periodicals
Medical physics
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610.153 - Journal URLs:
- http://scitation.aip.org/content/aapm/journal/medphys ↗
https://aapm.onlinelibrary.wiley.com/journal/24734209 ↗
http://www.aip.org/ ↗ - DOI:
- 10.1002/mp.14663 ↗
- Languages:
- English
- ISSNs:
- 0094-2405
- Deposit Type:
- Legaldeposit
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- Available online (eLD content is only available in our Reading Rooms) ↗
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- British Library DSC - 5531.130000
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