H Bernstine1, V Sopov2, N Yefremov2, M Nidam2, M Gabbai3, J Sosna4, D Groshar5. 1. Department of Nuclear Medicine, Rabin Medical Center, Petah Tikva, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. 2. Department of Nuclear Medicine, Rabin Medical Center, Petah Tikva, Israel. 3. Department of Radiology, Hadassah Hebrew University Medical Center, Jerusalem, Israel. 4. Department of Radiology, Hadassah Hebrew University Medical Center, Jerusalem, Israel; Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. 5. Department of Nuclear Medicine, Rabin Medical Center, Petah Tikva, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Nuclear Medicine, Assuta Medical Center, Tel Aviv, Israel. Electronic address: davidgr2@clalit.org.il.
Abstract
AIM: To determine the effect of low tube voltage on positron-emission tomography (PET) image quality, quantitative analysis, and radiation dose in a combined PET/computed tomography (CT) study in patients with normal body mass index (BMI). MATERIALS AND METHODS: One hundred and twenty-nine examinations performed in 46 patients (mean age 57 years), who had at least two separate studies were retrospectively evaluated; at least one with 120 kVp and one with 80 kVp. Three independent readers reviewed all PET images and graded the image quality. PET signal and noise were recorded on the liver, spleen, fat, bone marrow, and aorta. CT dose index (CTDI) and the dose-length product (DLP) were used for CT radiation dose estimation. A mixed-effects model analysis was used for comparison of estimated radiation dose and PET data. RESULTS: There was a significant decrease of 15% in the radiation dose estimates between 80 and 120 kVp (DLP 946.2 ± 189 versus 1157.0 ± 236, respectively; p < 0.001). There was an increase of 12% in PET signal in the normal liver with 80 kVp. The average score of PET image quality obtained between 80 and 120 kVp was 4.85 ± 0.42 versus 4.90 ± 0.27, respectively (p = 0.47). CONCLUSION: PET/80 kVp CT has no statistically significant difference in the PET image quality and quantitative analysis compared to PET/120 kVp and may be used in selected patients to reduce the radiation dose.
AIM: To determine the effect of low tube voltage on positron-emission tomography (PET) image quality, quantitative analysis, and radiation dose in a combined PET/computed tomography (CT) study in patients with normal body mass index (BMI). MATERIALS AND METHODS: One hundred and twenty-nine examinations performed in 46 patients (mean age 57 years), who had at least two separate studies were retrospectively evaluated; at least one with 120 kVp and one with 80 kVp. Three independent readers reviewed all PET images and graded the image quality. PET signal and noise were recorded on the liver, spleen, fat, bone marrow, and aorta. CT dose index (CTDI) and the dose-length product (DLP) were used for CT radiation dose estimation. A mixed-effects model analysis was used for comparison of estimated radiation dose and PET data. RESULTS: There was a significant decrease of 15% in the radiation dose estimates between 80 and 120 kVp (DLP 946.2 ± 189 versus 1157.0 ± 236, respectively; p < 0.001). There was an increase of 12% in PET signal in the normal liver with 80 kVp. The average score of PET image quality obtained between 80 and 120 kVp was 4.85 ± 0.42 versus 4.90 ± 0.27, respectively (p = 0.47). CONCLUSION: PET/80 kVp CT has no statistically significant difference in the PET image quality and quantitative analysis compared to PET/120 kVp and may be used in selected patients to reduce the radiation dose.
Authors: Marvin Grossmann; Andreas A Giannopoulos; Fabiola A Bechtiger; Michael Messerli; Moritz Schwyzer; Dominik C Benz; Ken Kudura; Catherine Gebhard; Christoph Gräni; Aju P Pazhenkottil; Philipp A Kaufmann; Ronny R Buechel Journal: J Nucl Cardiol Date: 2018-06-19 Impact factor: 5.952
Authors: Brett W Sperry; Timothy M Bateman; Esma A Akin; Paco E Bravo; Wengen Chen; Vasken Dilsizian; Fabien Hyafil; Yiu Ming Khor; Robert J H Miller; Riemer H J A Slart; Piotr Slomka; Hein Verberne; Edward J Miller; Chi Liu Journal: J Nucl Cardiol Date: 2022-07-21 Impact factor: 3.872