64-MDCT Coronary Angiography: Phantom Study of Effects of Vascular Attenuation on Detection of Coronary Stenosis

Fei, Xiaolu; Du, Xin; Yang, Qi; Shen, Yun; Li, Pengyu; Jing-min, Liao

doi:10.2214/ajr.07.2653

Cited by 86 publications

(62 citation statements)

References 20 publications

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“…Many studies have reported the feasibility of coronary CTA for the accurate diagnosis and quantification of these 2 variables in patients with coronary artery disease (CAD), 7-13 but previous experimental and clinical studies have shown that coronary attenuation in coronary CTA affects the assessment of both coronary artery stenosis and plaque. 14- 18 Lower coronary attenuation may decrease the diagnostic accuracy of coronary artery stenosis, whereas higher coronary attenuation may underestimate low-…”

mentioning

confidence: 99%

Optimization of Coronary Attenuation in Coronary Computed Tomography Angiography Using Diluted Contrast Material

Kawaguchi

Kurata

Nishiyama

et al. 2014

Circ J

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mentioning

confidence: 99%

Optimization of Coronary Attenuation in Coronary Computed Tomography Angiography Using Diluted Contrast Material

Kawaguchi

Kurata

Nishiyama

et al. 2014

Circ J

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“…Fei et al (2008) reported that the best aortic CT number for cardiac examinations was over 350 HU at 120 kVp for maintaining image quality. Considering the reported data and our clinical experience, our study set the iodine contrast so that to 350 HU at 120 kVp.…”

Section: Discussionmentioning

confidence: 99%

Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms

et al. 2016

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BackgroundTo figure out the relationship between image noise and contrast noise ratio (CNR) at different tube voltages, using anthropomorphic new-born and 1-year-old phantoms, and to discuss the feasibility of radiation dose reduction, based on the obtained CNR index from image noise. We performed helical scans of the anthropomorphic new-born and 1-year-old phantoms. The CT numbers of the simulated aorta and image noise of the simulated mediastinum were measured; then CNR was calculated on 80, 100, and 120-kVp images reconstructed with filtered back projection (FBP) and iterative reconstruction (IR). We also measured the center and surface dose in the case of CNR of 14 using radio-photoluminescence glass dosimeters.ResultsThe CT number of the simulated aorta was increased with decreasing tube voltage from 120 to 80 kVp (362.5–535.1 HU for the new-born, 358.9–532.6 HU for the 1-year-old). At CNR of 14, the center dose was 0.4, 0.6 and 0.9 mGy at FBP and 0.5, 0.6 and 0.9 mGy at IR and with the new-born phantom acquired at 80, 100 and 120 kVp, respectively. The center dose for FBP image was reduced by 56% at 80 kVp, 34% at 100 kVp for the new-born and 36% at 80 kVp, 22% at 100 kVp for the 1-year-old compared with that at 120 kVp. We obtained a relationship between image noise and CNR at different tube voltages using the anthropomorphic new-born and 1-year-old phantoms.ConclusionThe use of index of CNR with low-tube voltage may achieve further radiation dose reduction in pediatric CT examination.

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“…We determined that the optimal density for obtaining sharp 3D images of the saphenous, perforator and deep veins in the entire lower extremity with the volume-rendering method was approximately 500 HU (Hounsfield units). 12) We conducted a preliminary study by imaging various dilutions of contrast medium in a test tube, and concluded that a ten-fold dilution was suitable for CT venography.…”

Section: Ct Studymentioning

confidence: 99%

Three-dimensional CT Venography: A Diagnostic Modality for the Preoperative Assessment of Patients with Varicose Veins

Sato

Orihashi

Takahashi

et al. 2011

Annals of Vascular Diseases

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Objective: We preoperatively assessed varicose veins by means of computed tomography (CT) with contrast injection in the veins of the lower extremity (CT venography). This paper reports the procedures, results and implications of CT venography from the surgical aspect. Methods: A total of 48 legs in 39 patients were examined. Contrast medium was diluted ten-fold and injected into the lower extremity veins, often using a dual route of injection. The images were reconstructed with the volume-rendering method. Results: CT venography clearly visualized the veins with a small amount of contrast medium and facilitated the identification of anatomy that was not suitable for passing the stripper. In addition, CT venography helped identify unusual types of varicose veins or uncommon sites of inflow of small saphenous veins. Such information was helpful for avoiding unexpected vascular injury or for minimizing skin incision. Dual-route injection was beneficial to minimize the blind zones. Doppler ultrasound could be more focused on hemodynamic assessment and determination of incision sites. Conclusions: CT Venography is feasible in all cases of varicose veins. When performed in conjunction with ultrasonography, it appears to facilitate the safe and efficient treatment of various types of varicose veins.

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64-MDCT Coronary Angiography: Phantom Study of Effects of Vascular Attenuation on Detection of Coronary Stenosis

Cited by 86 publications

References 20 publications

Optimization of Coronary Attenuation in Coronary Computed Tomography Angiography Using Diluted Contrast Material

Optimization of Coronary Attenuation in Coronary Computed Tomography Angiography Using Diluted Contrast Material

Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms

Three-dimensional CT Venography: A Diagnostic Modality for the Preoperative Assessment of Patients with Varicose Veins

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