Abstract | OBJECTIVES: The purpose of this study was to evaluate the impact of attenuation-based kilovoltage (kV) pair selection in dual source dual energy (DSDE)- pulmonary embolism ( PE) protocol examinations on radiation dose savings and image quality. METHODS: A prospective study was carried out on 118 patients with suspected PE. In patients in whom attenuation-based kV pair selection selected the 80/140Sn kV pair, the pre-scan 100/140Sn CTDIvol (computed tomography dose index volume) values were compared with the pre-scan 80/140Sn CTDIvol values. Subjective and objective image quality parameters were assessed. RESULTS: Attenuation-based kV pair selection switched to the 80/140Sn kV pair ("switched" cohort) in 63 out of 118 patients (53%). The mean 100/140Sn pre-scan CTDIvol was 8.8 mGy, while the mean 80/140Sn pre-scan CTDIvol was 7.5 mGy. The average estimated dose reduction for the "switched" cohort was 1.3 mGy (95% CI 1.2, 1.4; p < 0.001), representing a 15% reduction in dose. After adjusting for patient weight, mean attenuation was significantly higher in the "switched" vs. "non-switched" cohorts in all five pulmonary arteries and in all lobes on iodine maps. CONCLUSIONS: This study demonstrates that attenuation-based kV pair selection in DSDE examination is feasible and can offer radiation dose reduction without compromising image quality. KEY POINTS: • Attenuation-based kV pair selection in dual energy examination is feasible. • It can offer radiation dose reduction to approximately 50% of patients. • Approximate 15% reduction in radiation dose was achieved using this technique. • The image quality is not compromised by use of attenuation-based kV pair selection.
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Authors | Rahul D Renapurkar, Andrew Primak, Joseph Azok, Jason Lempel, Yasmeen Tandon, Jennifer Bullen, Frank Dong, Wadih Karim, Ruffin Graham |
Journal | European radiology
(Eur Radiol)
Vol. 27
Issue 8
Pg. 3283-3289
(Aug 2017)
ISSN: 1432-1084 [Electronic] Germany |
PMID | 28091793
(Publication Type: Journal Article)
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Topics |
- Adult
- Aged
- Body Weight
- Computed Tomography Angiography
(methods, standards)
- Feasibility Studies
- Female
- Humans
- Male
- Middle Aged
- Prospective Studies
- Pulmonary Artery
(diagnostic imaging)
- Pulmonary Embolism
(diagnostic imaging)
- Radiation Dosage
- Radiography, Thoracic
(methods, standards)
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