Radiation dose and image quality at high-pitch CT angiography of the aorta: intraindividual and interindividual comparisons with conventional CT angiography
OBJECTIVE: The objective of our study was to evaluate radiation dose and quantitative image quality parameters at high-pitch CT angiography (CTA) of the aorta compared with conventional CTA. MATERIALS AND METHODS: We studied the examinations of 110 patients (65 men and 45 women; mean age ± SD, 64 ±...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2012
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| In: |
American journal of roentgenology
Year: 2012, Volume: 199, Issue: 6, Pages: 1402-1409 |
| ISSN: | 1546-3141 |
| DOI: | 10.2214/AJR.12.8652 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.2214/AJR.12.8652 Verlag, kostenfrei, Volltext: https://www.ajronline.org/doi/10.2214/AJR.12.8652 
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| Author Notes: | Paul Apfaltrer, E. Lexworth Hanna, U. Joseph Schoepf, J. Reid Spears, Stefan O. Schoenberg, Christian Fink, Rozemarijn Vliegenthart |
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| 245 | 1 | 0 | |a Radiation dose and image quality at high-pitch CT angiography of the aorta |b intraindividual and interindividual comparisons with conventional CT angiography |c Paul Apfaltrer, E. Lexworth Hanna, U. Joseph Schoepf, J. Reid Spears, Stefan O. Schoenberg, Christian Fink, Rozemarijn Vliegenthart |
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| 520 | |a OBJECTIVE: The objective of our study was to evaluate radiation dose and quantitative image quality parameters at high-pitch CT angiography (CTA) of the aorta compared with conventional CTA. MATERIALS AND METHODS: We studied the examinations of 110 patients (65 men and 45 women; mean age ± SD, 64 ± 15 years) who had undergone CTA of the entire aorta on a second-generation dual-source CT system; 50 examinations were performed in high-pitch mode. The mean arterial attenuation, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and figure of merit (FOM) were calculated for the high-pitch CTA and conventional CTA groups. Radiation exposures were compared. RESULTS: All studies were considered of diagnostic quality. At high-pitch CTA, the mean tube voltage and tube current-exposure time product were 118 ± 7 kV (SD) and 197 ± 78 mAs compared with 120 ± 1 kV and 258 ± 78 mAs, respectively, at conventional CTA (p < 0.05). The mean volume CT dose index, dose-length product, and effective dose were 8.1 ± 2.4 mGy, 561.1 ± 178.6 mGy × cm, and 9.6 ± 3.0 mSv at high-pitch CTA and 18.3 ± 7.7 mGy, 1162.6 ± 480.1 mGy × cm, and 19.8 ± 8.2 mSv at conventional CTA (p < 0.001). Attenuation was similar for both protocols, whereas significantly less contrast medium was injected for high-pitch CTA than for standard-pitch CTA (87.3 ± 16 mL vs 97.9 ± 16 mL, respectively; p < 0.01). The SNR and CNR were significantly lower in the high-pitch CTA examinations (p < 0.01), whereas the FOM was nonsignificantly higher. Twenty patients underwent both high-pitch CTA and conventional CTA, with a 45% reduction in radiation dose (p < 0.001). CONCLUSION: High-pitch CTA of the aorta yields 45-50% reduction of radiation exposure as well as contrast medium savings with maintained vessel attenuation. | ||
| 650 | 4 | |a Aged | |
| 650 | 4 | |a Algorithms | |
| 650 | 4 | |a Angiography, Digital Subtraction | |
| 650 | 4 | |a Aortic Diseases | |
| 650 | 4 | |a Aortography | |
| 650 | 4 | |a Body Mass Index | |
| 650 | 4 | |a Chi-Square Distribution | |
| 650 | 4 | |a Contrast Media | |
| 650 | 4 | |a Female | |
| 650 | 4 | |a Humans | |
| 650 | 4 | |a Iohexol | |
| 650 | 4 | |a Linear Models | |
| 650 | 4 | |a Male | |
| 650 | 4 | |a Middle Aged | |
| 650 | 4 | |a Radiation Dosage | |
| 650 | 4 | |a Radiographic Image Interpretation, Computer-Assisted | |
| 650 | 4 | |a Retrospective Studies | |
| 650 | 4 | |a Signal-To-Noise Ratio | |
| 650 | 4 | |a Tomography, X-Ray Computed | |
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| 773 | 1 | 8 | |g volume:199 |g year:2012 |g number:6 |g pages:1402-1409 |g extent:8 |a Radiation dose and image quality at high-pitch CT angiography of the aorta intraindividual and interindividual comparisons with conventional CT angiography |
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