Improved Display of Hepatic Arterial Anatomy Using Differential Subsampling With Cartesian Ordering (DISCO) With Gadoxetic Acid‐Enhanced MRI: Comparison With Single Arterial Phase MRI and Computed Tomographic Angiography

2019 ◽  
Vol 51 (6) ◽  
pp. 1766-1776
Author(s):  
Yi Wei ◽  
Guoyong Chen ◽  
Hehan Tang ◽  
Yuan Yuan ◽  
Zixing Huang ◽  
...  
Keyword(s):  
Computed Tomographic Angiography ◽  
Gadoxetic Acid ◽  
Arterial Phase ◽  
Computed Tomographic ◽  
Enhanced Mri ◽  
Tomographic Angiography ◽  
Arterial Anatomy

scholarly journals Reliability of virtual non-contrast computed tomography angiography: comparing it with the real deal

2018 ◽  
Vol 7 (7-8) ◽  
pp. 205846011879011 ◽  
Author(s):  
Leena Lehti ◽  
Marcus Söderberg ◽  
Peter Höglund ◽  
Ulf Nyman ◽  
Anders Gottsäter ◽  
...  
Keyword(s):  
Image Quality ◽  
Subjective Evaluation ◽  
Computed Tomographic Angiography ◽  
Dual Energy ◽  
Image Noise ◽  
Arterial Phase ◽  
Dual Energy Ct ◽  
Computed Tomographic ◽  
Contrast Enhanced ◽  
Tomographic Angiography

Background Computed tomographic angiography (CTA) may require a non-contrast enhanced dataset for the diagnostic workup. By using dual-energy acquisition, it is possible to obtain a virtual non-contrast-enhanced (VNC) dataset, thereby possibly eliminating the non-contrast acquisition and reducing the radiation dose. Purpose To compare image quality of VNC images reconstructed from arterial phase dual-energy CTA to true non-contrast (TNC) images, and to assess whether VNC images were of sufficient quality to replace TNC images. Material and methods Thirty consecutive patients with suspected abdominal aortic aneurysm, aortic dissection, or subacute control after EVAR/TEVAR were examined with dual-energy CT (DECT). The examination protocol included a single-energy TNC, DECT arterial phase (80 kV/Sn140 kV), and single-energy in venous phase of the aorta. A VNC dataset was obtained from the DE acquisition from arterial phase scans. Mean attenuation and image noise were measured within regions of interest at three levels in the aorta in TNC and VNC images. Comparison of the TNC and VNC images for artefacts was made side-by-side. Subjective evaluation included overall image quality on a 4-grade scale, and quantitative analysis of algorithm-induced artefacts by two experienced readers. Results For all cases, the aortic attenuation was significantly higher at VNC than at TNC. Image noise measured quantitatively was also significantly higher at VNC than at TNC. Subjective image quality was lower for VNC (mean = 3.1 for VNC, 3.7 = for TNC) but there were no cases rated non-diagnostic. Conclusion VNC images based on arterial phase CTA have significantly higher mean attenuation and higher noise levels compared to TNC.

Efficiency Assessment of Multidetector-Row Computed Tomographic Angiography Using Reconstruction With Locoregional Perforator Flaps

2021 ◽  
pp. 229255032110247
Author(s):  
Pavlo O. Badiul ◽  
Sergii V. Sliesarenko ◽  
Nataliia O. Cherednychenko ◽  
Olga V. Morgun
Keyword(s):  
Perforator Flap ◽  
Computed Tomographic Angiography ◽  
Surgical Reconstruction ◽  
Patient Treatment ◽  
Controlled Study ◽  
Control Group ◽  
Perforator Flaps ◽  
Multidetector Row ◽  
Computed Tomographic ◽  
Tomographic Angiography

Background: Reconstruction with the use of perforator flaps makes it possible to make the skin surface resistant to the influence of mechanical factors and as similar to the lost skin cover as possible. However, while planning any flap, along with the design of the required shape and size, its blood supply should be taken into account to ensure optimal viability. Therefore, the task to precisely determine the topographic–anatomical relationships suitable for the formation of a pedicle of perforators is still relevant. The aim of this study was to increase the efficiency of surgical reconstruction of wound defects by transposition of locoregional perforator flaps. Methods: The authors conducted a retrospective analysis of 72 cases of reconstruction by means of locoregional perforator flaps with vascular pedicle detachment to determine the efficiency of preoperative diagnostic preparation with the help of multidetector-row computed tomographic angiography (MDCT) in the process of reconstruction. Thirty-seven individual cases of surgical interventions were chosen using a case-controlled study from the study group when MDCT with angiography was used for preoperative planning of perforator flaps, as well as 35 control cases similar in terms of important predictive peculiarities with the reconstruction at the same level of difficulty. The patient groups were precisely matched by gender ( P = .950), age ( P = .804), flap area ( P = .192), and type of reconstruction that was performed. Results: In all cases, the location of the perforator with a diameter greater than 1.0 mm was marked. All perforators determined during MDCT scanning were faultlessly localized intraoperatively. The distance between the intraoperative position of the perforator and the position obtained in the result of the examination did not exceed 1 cm. There was no need to change the planned design of the flap intraoperatively. In all cases where MDCT was performed, the duration of the surgical procedure varied from 60 to 150 minutes (average: 120.77 [18.90] minutes) and was reduced by 49.40 minutes (95% CI: 39.17-59.63) compared with the patients who did not undergo preoperative visualization of perforators where the average duration of the operation was 170.17 (19.19) minutes (from 140 to 220 minutes). Among the patients examined by MDCT, surgical complications were noted in 5 cases (13.51%) compared to 14 cases (40.00%) in the control group. Conclusions: The preoperative MDCT for the locoregional perforator flap reconstruction makes it possible to increase the efficiency of patient treatment given the reduction in surgery duration by 49.40 minutes (95% CI: 39.17-59.63) on average and the reduction in the level of postsurgery complications from 40% to 13.5% compared with the group of patients in whom presurgical visualization was not performed ( P = .031).

scholarly journals Microsurgical Anatomy of the Anterior Circulation of the Brain Adjusted to the Neurosurgeon’s Daily Practice

2021 ◽  
Vol 11 (4) ◽  
pp. 519
Author(s):  
Tomas Poblete ◽  
Daniel Casanova ◽  
Miguel Soto ◽  
Alvaro Campero ◽  
Jorge Mura
Keyword(s):  
Daily Practice ◽  
Computed Tomographic Angiography ◽  
Poor Quality ◽  
Surgical Anatomy ◽  
Microsurgical Anatomy ◽  
Anterior Circulation ◽  
Computed Tomographic ◽  
Intrinsic Complexity ◽  
Tomographic Angiography

The study of cerebrovascular anatomy can be difficult and may take time due to its intrinsic complexity. However, it can also be difficult for the following reasons: the excessive description of neuroanatomy making articles hard to read, the unclear clinical application of what is written, the use of simplified or intricate schematic drawings that are not always appropriate for effective teaching, the poor quality of neuroanatomy dissections and the use of unusual views of figures that are not strictly related to the most frequent neuroimages to be interpreted in daily practice. Because of this, we designed an article that incorporates original and accurate anatomical dissections in an attempt to improve its comprehensibility. Five formalin-fixed adult cadaveric heads, whose vessels were injected with a colored silicone mixture (red for arteries and blue for veins), were dissected and examined under a microscope with magnifications from 3× to 40×. Special emphasis has been placed on correlating topographic anatomy with routine neuroimaging studies from computed tomographic angiography (CTA) and digital subtraction angiography (DSA). The essential surgical anatomy in a neurosurgeon’s daily practice is also described. The cadaveric dissections included in this study contribute to the understanding of the cerebrovascular anatomy necessary for the neurosurgeon’s daily practice.

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