Comparación de la calidad de imagen y dosis de radiación en angio-tomografía computarizada de arterias periféricas con 80 y 100kV

Pernas, Roque Oca; Sánchez-Gracián, C. Delgado; Fuente, G. Tardáguila de la; Valle, A. Fernández del; Priegue, N. Silva; Vázquez, María; López, Carmen Trinidad

doi:10.1016/j.rx.2012.06.013

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…Despite the lower CM dose used in our current study, IMR, combined with the lower tube voltage, also increased the CT value compared to that of the FBP group. These results are consistent with previous studies of low tube voltage, which show increased CT values in the vessels 26 , 27 . Moreover, the excessive volume of the CM is closely related to CM-induced nephropathy and a higher extravasation rate 24 , 28 , 29 .…”

Section: Discussionsupporting

confidence: 93%

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Cheng

Xing

et al. 2018

Sci Rep

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This study aimed to evaluate the imaging quality of head and neck computed tomographic angiography (CTA) in pediatric patients at a lowered radiation dose by combining an iterative model reconstruction (IMR) with low voltage scanning. Eighty-three pediatric patients were randomized into two groups as follows: Group A (n = 42), 100 kV/50 ml contrast media (CM), using filtered back projection (FBP); and Group B (n = 41), 80 kV/30 ml CM, using IMR. The enhanced CT value of the arteries, the image noise, the signal-to-noise ratio (SNR)/contrast-to-noise ratio (CNR), the image quality, the effective radiation dose (ED) and the iodine intake were compared between the two groups. The mean ED and iodine intake of group B were reduced by 69.8% and 40.0%, respectively, compared to those of group A. The mean CT values of the arteries in group B were higher than those in group A (p < 0.01), whereas the image noise of group B was lower than that of group A (p < 0.01). Group B exhibited a better image quality and a higher mean CNR/SNR than that of group A (p < 0.01). Compared to FBP, IMR in head and neck CTA enables a significant reduction in the radiation dose while preserving the diagnostic image quality. Thus, IMR, combined with low tube voltage scanning, provided an excellent solution for improving the image quality of craniocervical vessels in children.

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Section: Discussionsupporting

confidence: 93%

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Cheng

Xing

et al. 2018

Sci Rep

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“…However, the fast scan speed may outrun the contrast bolus, and therefore, large quantities of contrast volume are not essential for vascular studies [ 5 ]. Furthermore, low kilovoltage (kVp) levels have been shown to improve contrast enhancement in CTA [ 6 , 7 ]. The disadvantages of this procedure lie in the beam hardening artefacts and the increase of image noise.…”

Section: Introductionmentioning

confidence: 99%

Dual Energy CT Angiography of Peripheral Arterial Disease: Feasibility of Using Lower Contrast Medium Volume

et al. 2015

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ObjectiveOne of the main drawbacks associated with Dual Energy Computed Tomography Angiography (DECTA) is the risk of developing contrast medium-induced nephropathy (CIN). The aim of the present study was firstly, to design an optimal CT imaging protocol by determining the feasibility of using a reduced contrast medium volume in peripheral arterial DECTA, and secondly, to compare the results with those obtained from using routine contrast medium volume.MethodsThirty four patients underwent DECTA for the diagnosis of peripheral arterial disease. They were randomly divided into two groups: Group 1 (routine contrast volume group) with n = 17, injection rate 4–5 ml/s, and 1.5 ml/kg of contrast medium, and Group 2 ((low contrast volume group), with n = 17, injection rate 4–5ml/s, and contrast medium volume 0.75 ml/kg. A fast kilovoltage—switching 64-slice CT scanner in the dual-energy mode was employed for the study. A total of 6 datasets of monochromatic images at 50, 55, 60, 65, 70 and 75 keV levels were reconstructed with adaptive statistical iterative reconstruction (ASIR) at 50%. A 4-point scale was the tool for qualitative analysis of results. The two groups were compared and assessed quantitatively for image quality on the basis of signal-to-noise ratio (SNR) and contrast-to-noise-ratio (CNR). Radiation and contrast medium doses were also compared.ResultsThe overall mean CT attenuation and mean noise for all lower extremity body parts was significantly lower for the low volume contrast group (p<0.001), and varied significantly between groups (p = 0.001), body parts (p<0.001) and keVs (p<0.001). The interaction between group body parts was significant with CT attenuation and CNR (p = 0.002 and 0.003 respectively), and marginally significant with SNR (p = 0.047), with minimal changes noticed between the two groups. Group 2 (low contrast volume group) displayed the lowest image noise between 65 and 70 keV, recorded the highest SNR and CNR at 65 keV, and produced significantly lower results with respect to contrast medium volume and duration of contrast injection (p<0.001). The effect of radiation dose was not statistically significant between the two groups.ConclusionsDECTA images created at 65 keV and 50% ASIR with low contrast medium volume protocol, yielded results that were comparable to routine contrast medium volume, with acceptable diagnostic images produced during the evaluation of peripheral arteries.

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“…Due to the increasing concern regarding radiogenic risk to patients during CTA procedures, a number of studies have been published internationally, which have focused on patient radiation during CTA procedures due to the large anatomic volumes included and acquisition of thinner slices. A large variability in patient radiation dose has been reported (Mafalanka et al, 2015, Brenner and Hall, 2007, Berrington de Gonzalez et al, 2009, Oca Pernas et al, 2014, Sabarudin and Sun, 2013). Further, it has been reported that patient effective doses during CTA procedures range between 2.2 and 24.4 mSv (Mafalanka et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Patient radiation biological risk in computed tomography angiography procedure

Alkhorayef

Babikir

Alrushoud

et al. 2017

Saudi Journal of Biological Sciences

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Computed tomography angiography (CTA) has become the most valuable imaging modality for the diagnosis of blood vessel diseases; however, patients are exposed to high radiation doses and the probability of cancer and other biological effects is increased. The objectives of this study were to measure the patient radiation dose during a CTA procedure and to estimate the radiation dose and biological effects. The study was conducted in two radiology departments equipped with 64-slice CT machines (Aquilion) calibrated according to international protocols. A total of 152 patients underwent brain, lower limb, chest, abdomen, and pelvis examinations. The effective radiation dose was estimated using ImPACT scan software. Cancer and biological risks were estimated using the International Commission on Radiological Protection (ICRP) conversion factors. The mean patient dose value per procedure (dose length product [DLP], mGy·cm) for all examinations was 437.8 ± 166, 568.8 ± 194, 516.0 ± 228, 581.8 ± 175, and 1082.9 ± 290 for the lower limbs, pelvis, abdomen, chest, and cerebral, respectively. The lens of the eye, uterus, and ovaries received high radiation doses compared to thyroid and testis. The overall patient risk per CTA procedure ranged between 15 and 36 cancer risks per 1 million procedures. Patient risk from CTA procedures is high during neck and abdomen procedures. Special concern should be provided to the lens of the eye and thyroid during brain CTA procedures. Patient dose reduction is an important consideration; thus, staff should optimize the radiation dose during CTA procedures.

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Comparación de la calidad de imagen y dosis de radiación en angio-tomografía computarizada de arterias periféricas con 80 y 100kV

Cited by 8 publications

References 22 publications

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Impact of iterative model reconstruction combined with dose reduction on the image quality of head and neck CTA in children

Dual Energy CT Angiography of Peripheral Arterial Disease: Feasibility of Using Lower Contrast Medium Volume

Patient radiation biological risk in computed tomography angiography procedure

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