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- “ Pulmonary CTA can be performed using a tube potential of 100 kVp in patients who weigh less than 100 Kg(220lb). Reducing the tube potential from 120 to 100 kVp results in a 37% reduction in radiation dose without a significant impact on diagnostic image quality.”
Image Quality and Radiation Dose of Pulmonary CT Angiography Performed Using 100 and 120 kVp
Fanous R et al
AJR 2012; 199:990-996 - “ Wide area-detector coronary CT angiography protocols have reduced radiation dose, with image quality maintained at the same level, compared with 64-MDCT technologies.”
Image Quality and Radiation Dose Stratified by Patient heart Rate for Coronary 64- and 320-MDCT Angiography
Fujimoto S et al.
AJR 2012; 765-770 - “ In conclusion, patients undergoing coronary imaging with 320-MDCT have a range of estimated radiation doses corresponding to heart rate. The beam pitch and phase window width can be adjusted with respect to heart rate to produce consistent high quality images.”
Image Quality and Radiation Dose Stratified by Patient heart Rate for Coronary 64- and 320-MDCT Angiography
Fujimoto S et al.
AJR 2012; 765-770
"Effective dose from coronary CT angiography by using volume scanning with an optimized exposure time of 5.8 mSv at 120 kVp and 4.4 mSv at 100 kVp, using International Commission on Radiological Protection (ICRP) publication 103 tissue-weighting factors."
Radiation Dose from Single-Heartbeat Coronary CT Angiography Performed with 320-Detector Row Volume Scanner
Einstein AJ et al.
Radiology 2010;254:698-706"Volume scanning markedly decreases coronary CT angiography radiation doses compared with those at helical scanning. When conversion coefficients are used to estimate effective dose from DLP, they should be appropriate for the scanner and scan mode used and reflect current tissue weighting factors."
Radiation Dose from Single-Heartbeat Coronary CT Angiography Performed with 320-Detector Row Volume Scanner
Einstein AJ et al.
Radiology 2010;254:698-706- How to reduce dose of a cardiac CT scan: Options
- ECG controled tube current modulation
- Adaptive pitch
- Reduced tube voltage of 100 kV
- Sequential scanning (step and shoot)
- Large detector coverage
- High pitch mode (Flash mode) "Adjustment of the scan length of CT coronary angiography using the images from calcium scoring instead of the scout view is feasible and is associated with a 16% reduction in radiation dose of dual source CT coronary angiography."
Scan Length Adjustment of CT Coronary Angiography Using the Calcium Scoring Scan: Effect on Radiation Dose
Leschka S et al.
AJR;194: March 2010 DOI:10.2214/AJR.09.2970" Radiation dose increase with the square of tube voltage and small changes in tube voltage result in a relatively large change in radiation dose (120 to 100 kV is a dose reduction of 40%, 120 to 80 kV is a reduction of 80%)."
Image Quality in a Low Radiation Exposure Protocol for Retrospectively ECG-Gated Coronary CT Angiography
Pflederer T, Achenbach S et al.
AJR 2009; 192:1045-1050"We found a significant decrease in radiation exposure--almost 39%-- by using a tube voltage of 100 kV instead of the most frequently recommended value of 120kV."
Image Quality in a Low Radiation Exposure Protocol for Retrospectively ECG-Gated Coronary CT Angiography
Pflederer T et al.
AJR 2009; 192:1045-1050"The purpose of our study was to systematically compare the image quality of dual source CT coronary angiography using 100kV instead of 120 kV."
Image Quality in a Low Radiation Exposure Protocol for Retrospectively ECG-Gated Coronary CT Angiography
Pflederer T et al.
AJR 2009; 192:1045-1050"The use of bismuth breast shields together with a lower kVp and automatic tube current modulation will reduce the absorbed radiation dose to the breast and lungs without degradation of image quality to the organs of the thorax for CTA detection of PE."
Radiation Dose Savings for Adult Pulmonary Embolus 64-MDCT Using Bismuth Breast Shields, Lower Peak Kilovoltage, and Automatic Tube Current Modulation
Hurwitz LM et al.
AJR 2009; 192:244-253- "For ECG gated coronary CT angiography, image noise equivalent to that of multidetector row CT can be achieved with dual-source CT at doses comparable to or up to a factor of two lower than the doses at multidetector row CT, depending on heart rate of the patient."
Dose Performance of a 64-Channel Dual-Source CT Scanner
McCollough CH et al.
Radiology 2007; 243:775-784