Dual-source computed tomography: Estimation of radiation exposure of ECG-gated and ECG-triggered coronary angiography

Ketelsen, Dominik; Thomas, Christoph; Werner, Matthias; Luetkhoff, Marie H.; Buchgeister, Markus; Tsiflikas, Ilias; Reimann, Anja; Burgstahler, Christof; Brodoefel, Harald; Kopp, Andreas F.; Claussen, Claus D.; Heuschmid, Martin

doi:10.1016/j.ejrad.2008.10.033

Cited by 28 publications

(23 citation statements)

References 26 publications

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“…Typically, the pitch is less than 1, usually between 0.2 and 0.5 in first-generation dualsource CTCA resulting in relevant overlaps by advancing the table much less than one detector width during one scanner rotation [3,7]. Thus, repeated exposure of the same heart region during several consecutive rotations causes an increase of radiation exposure.…”

Section: Discussionmentioning

confidence: 99%

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High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

Ketelsen¹,

Buchgeister²,

Fenchel³

et al. 2012

Fortschr Röntgenstr

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properly cited.Purpose. To estimate effective dose and organ equivalent doses of prospective ECG-triggered high-pitch CTCA. Materials and Methods. For dose measurements, an Alderson-Rando phantom equipped with thermoluminescent dosimeters was used. The effective dose was calculated according to ICRP 103. Exposure was performed on a second-generation dual-source scanner (SOMATOM Definition Flash, Siemens Medical Solutions, Germany). The following scan parameters were used: 320 mAs per rotation, 100 and 120 kV, pitch 3.4 for prospectively ECG-triggered high-pitch CTCA, scan range of 13.5 cm, collimation 64 × 2 × 0.6 mm with z-flying focal spot, gantry rotation time 280 ms, and simulated heart rate of 60 beats per minute. Results. Depending on the applied tube potential, the effective whole-body dose of the cardiac scan ranged from 1.1 mSv to 1.6 mSv and from 1.2 to 1.8 mSv for males and females, respectively. The radiosensitive breast tissue in the range of the primary beam caused an increased female-specific effective dose of 8.6%±0.3% compared to males. Decreasing the tube potential, a significant reduction of the effective dose of 35.8% and 36.0% can be achieved for males and females, respectively (P < 0.001). Conclusion. The radiologist and the CT technician should be aware of this new dose-saving strategy to keep the radiation exposure as low as reasonablly achievable.

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Section: Discussionmentioning

confidence: 99%

“…The phantom was equipped with 117 thermoluminescent dosimeters (TLDs) with dimension of 1 × 1 × 6 mm (TLD-100H, Bicon-Harshow, Radiation Measurement Products, Cleveland, OH, USA) to perform radiation exposure measurements [2][3][4].…”

Section: Dosimetrymentioning

confidence: 99%

High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

Ketelsen¹,

Buchgeister²,

Fenchel³

et al. 2012

Fortschr Röntgenstr

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“…Higher effective doses from CTCA examinations have been reported in females than in males [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Chest Circumference as a Predictive Parameter of Computed Tomography Coronary Angiography Radiation Doses from Dual-Source Computed Tomography

Sagsoz

Bayraktutan

Oğul

et al. 2013

EAJM

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Objective: Our aim in this study was to determine the relationship between chest circumference and the radiation doses received by breast tissues during Dual-Source Computed Tomography (DSCT) cardiac scans. Materials and Methods:Routine cardiac DSCT examinations with similar exposure lengths were applied to 30 female patients. The scanogram image, multi-slice helical scan x-ray tube voltage and anode-cathode current were adjusted automatically according to attenuation for each patient during the scanogram acquisition. The standard protocol was otherwise applied to all patients. The 30 patients had an average weight of 67.8±15.3 kg, and the average length of the scanned region was 278.0±11.6 mm. Radiation doses were calculated from the dose-length product (DLP) and the computed tomography dose index (CTDI) scanner data values. The correlations between radiation dose and chest circumference were investigated. The level of significance was set at p<0.05. Results:For routine cardiac DSCT scans, the average values were as follows: total DLP: 715.54±317.01 mGycm, CTDIvol: 40.79±19.41 mGy, and effective dose (ED): 17.89±7.93 mSv. The chest circumference of patients correlates well with their radiation exposure (p<0.01). Conclusion:The distribution of different tissues throughout the human body may vary among races and genders. Because of this, many researchers use body mass index (BMI) to set image quality and predict the radiation dose distribution from general computed tomography (CT) examinations. Additional anthropomorphic phantom studies should be conducted to determine more accurate conversion factors and, hence, better ED predictions.Key Words: Breast, Cardiac, DSCT, Radiation dose Özet Amaç: Bu çalışmadaki amacımız göğüs çevresi ve Dual-Source Bilgisayarlı Tomografi (DSCT) kardiyak taramaları sırasında meme dokusu tarafından alınan radyasyon dozları arasındaki ilişkiyi belirlemektir. Gereç ve Yöntem:Benzer tarama uzunluklarına sahip rutin kardiyak DSCT incelemeler 30 kadın hastaya uygulandı. Spot görüntü, çok kesitli helikal tarama x-ışını tüpü gerilim ve anot-katot akımı spot gö-rüntü alınması sırasında belirlenerek her hasta için azaltma miktarına göre otomatik olarak ayarlandı. Aksi belirtilmedikçe standart protokol tüm hastalara uygulandı. 30 hastanın, ortalama ağırlığı 67.8±15.3 kg'dı ve taranan bölgenin ortalama uzunluğu 278.0±11.6 mm idi. Radyasyon dozları doz uzunluk çarpımı (DLP) ve bilgisayarlı tomografi doz indeksi (CTDI) tarayıcı verilerinden hesaplandı. Radyasyon dozu ve göğüs çevresi uzunluğu arasındaki ilişki araştırıldı. Anlamlılık düzeyi p<0.05 olarak tespit edildi. Sonuç: İnsan vücudu boyunca farklı dokuların dağılımı ırklar ve cinsiyetler arasında farklılık gösterebilmektedir. Bu sebeple, birçok araştırmacı görüntü kalitesini ayarlayabilmek ve genel bilgisayarlı tomografi (BT) incelemelerinde soğrulan radyasyon doz dağılımını tahmin etmek için vücut kitle indeksini (BMI) kullanmaktadır. Daha iyi ED tahminleri ve daha doğru dönüşüm faktörleri belirlemek amacıyla ek antropomorfik fantom...

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“…Computed tomographic coronary angiography (CTCA) has become a widely-used diagnostic tool for CAD as a noninvasive examination with high accuracy and negative predictive value [3]. However, the radiation exposure associated with CTCA is still a concern in the community [4,5]. To reduce the radiation burden, many dose-saving techniques have been developed [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…However, the radiation exposure associated with CTCA is still a concern in the community [4,5]. To reduce the radiation burden, many dose-saving techniques have been developed [5,6]. Among these techniques prospective ECG-triggering CTCA is considered a good method of significantly reducing patient dose from 10.7 to 18.9 mSv using retrospective ECG-gated to 2.8-3.8 mSv on 64 multi-detector row spiral CT (64-MDCT) [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Diagnostic accuracy of dual-source CT coronary angiography with prospective ECG-triggering on different heart rate patients

Sun

Lü

et al. 2011

Eur Radiol

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Dual-source computed tomography: Estimation of radiation exposure of ECG-gated and ECG-triggered coronary angiography

Cited by 28 publications

References 26 publications

High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

Chest Circumference as a Predictive Parameter of Computed Tomography Coronary Angiography Radiation Doses from Dual-Source Computed Tomography

Diagnostic accuracy of dual-source CT coronary angiography with prospective ECG-triggering on different heart rate patients

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