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14 results on '"Spears, J Reid"'

6. Fully automated derivation of coronary artery calcium scores and cardiovascular risk assessment from contrast medium-enhanced coronary CT angiography studies

Author

Ebersberger, Ullrich, Eilot, Dov, Goldenberg, Roman, Lev, Alon, Spears, J. Reid, Rowe, Garrett W., Gallagher, Nicholas Y., Halligan, William T., Blanke, Philipp, Makowski, Marcus R., Krazinski, Aleksander W., Silverman, Justin R., Bamberg, Fabian, Leber, Alexander W., Hoffmann, Ellen, and Schoepf, U. Joseph

Published
2013
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8. Transient Ischemic Dilation of the Left Ventricle on SPECT: Correlation with Findings at Coronary CT Angiography

Author

Halligan, William T., primary, Morris, Pamela B., additional, Schoepf, U. Joseph, additional, Mischen, Blaine T., additional, Spearman, James V., additional, Spears, J. Reid, additional, Blanke, Philipp, additional, Cho, Young Jun, additional, Silverman, Justin R., additional, Chiaramida, Salvatore A., additional, and Ebersberger, Ullrich, additional

Published
2014
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9. Cardiovascular CT angiography in neonates and children: Image quality and potential for radiation dose reduction with iterative image reconstruction techniques

Author

Tricarico, Francesco, primary, Hlavacek, Anthony M., additional, Schoepf, U. Joseph, additional, Ebersberger, Ullrich, additional, Nance, John W., additional, Vliegenthart, Rozemarijn, additional, Cho, Young Jun, additional, Spears, J. Reid, additional, Secchi, Francesco, additional, Savino, Giancarlo, additional, Marano, Riccardo, additional, Schoenberg, Stefan O., additional, Bonomo, Lorenzo, additional, and Apfaltrer, Paul, additional

Published
2012
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12. Fully automated derivation of coronary artery calcium scores and cardiovascular risk assessment from contrast medium-enhanced coronary CT angiography studies

Author

Ebersberger, Ullrich, primary, Eilot, Dov, additional, Goldenberg, Roman, additional, Lev, Alon, additional, Spears, J. Reid, additional, Rowe, Garrett W., additional, Gallagher, Nicholas Y., additional, Halligan, William T., additional, Blanke, Philipp, additional, Makowski, Marcus R., additional, Krazinski, Aleksander W., additional, Silverman, Justin R., additional, Bamberg, Fabian, additional, Leber, Alexander W., additional, Hoffmann, Ellen, additional, and Schoepf, U. Joseph, additional

Published
2012
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13. CT evaluation of coronary artery stents with iterative image reconstruction: improvements in image quality and potential for radiation dose reduction

Author

Ebersberger, Ullrich, primary, Tricarico, Francesco, additional, Schoepf, U. Joseph, additional, Blanke, Philipp, additional, Spears, J. Reid, additional, Rowe, Garrett W., additional, Halligan, William T., additional, Henzler, Thomas, additional, Bamberg, Fabian, additional, Leber, Alexander W., additional, Hoffmann, Ellen, additional, and Apfaltrer, Paul, additional

Published
2012
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14. Radiation dose and image quality at high-pitch CT angiography of the aorta: intraindividual and interindividual comparisons with conventional CT angiography.

Author

Apfaltrer P, Hanna EL, Schoepf UJ, Spears JR, Schoenberg SO, Fink C, and Vliegenthart R

Subjects
Aged, Algorithms, Angiography, Digital Subtraction, Body Mass Index, Chi-Square Distribution, Contrast Media, Female, Humans, Iohexol, Linear Models, Male, Middle Aged, Radiographic Image Interpretation, Computer-Assisted, Retrospective Studies, Signal-To-Noise Ratio, Aortic Diseases diagnostic imaging, Aortography methods, Radiation Dosage, Tomography, X-Ray Computed methods
Abstract

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.

Published
2012
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