scholarly journals Visualization of flow dynamics in the portal circulation using 320-detector-row computed tomography: a feasibility study

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Ken Kageyama ◽  
Akira Yamamoto ◽  
Atsushi Jogo ◽  
Shinichiro Izuta ◽  
Daisuke Himoto ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Flow Direction ◽  
Color Doppler ◽  
Splenic Vein ◽  
Color Doppler Ultrasound ◽  
Flow Dynamics ◽  
Multidetector Row Computed Tomography ◽  
Portal Circulation ◽  
4D Ct ◽  
Gastrorenal Shunt

AbstractMultidetector row computed tomography (CT) scanners perform dynamic scanning and have a wide scan range. Time-resolved three-dimensional CT (i.e., 4D CT) has recently enabled visualization of flow in neurovascular vessels. We hypothesized that 4D CT technology would be a useful and non-invasive method for visualizing the flow dynamics of the portal circulation. The aim of this study was to evaluate the technical feasibility of 4D CT for visualizing flow dynamics in the portal circulation using 320-detector-row CT. 4D CT images of 18 consecutive patients with portal circulation including gastrorenal shunt were retrospectively evaluated for their ability to generate flow dynamics of the portal circulation. Flow dynamics could be visualized by 4D CT in 68 of the 72 vessels in the portal vein, splenic vein, superior mesenteric vein, and gastrorenal shunt. Flow direction could not be identified in four vessels, all of them being superior mesenteric veins. Flow direction was recognized on 4D CT in the 68 vessels of the portal circulation. A preliminary validation study revealed that flow direction of all 19 vessels in the portal circulation had concordance between 4D CT and color Doppler ultrasound. 4D CT could visualize flow dynamics of the portal circulation.

Color Doppler Ultrasound versus Computed Tomography Angiography for Preoperative Anterolateral Thigh Flap Perforator Imaging: A Systematic Review and Meta-Analysis

2021 ◽  
Author(s):  
Reece Moore ◽  
Donna Mullner ◽  
Georgina Nichols ◽  
Isis Scomacao ◽  
Fernando Herrera
Keyword(s):  
Computed Tomography ◽  
Doppler Ultrasound ◽  
Computed Tomography Angiography ◽  
False Positive ◽  
Color Doppler ◽  
Color Doppler Ultrasound ◽  
Preoperative Imaging ◽  
Anterolateral Thigh Flap ◽  
Anterolateral Thigh ◽  
Alt Flap

Abstract Background The anterolateral thigh (ALT) perforator flap is a commonly used flap with a predictable, though often variable, perforator anatomy. Preoperative imaging with color Doppler ultrasound (CDU) and computed tomography angiography (CTA) of ALT flap perforators can be a useful tool for flap planning. This study provides a complete review and analysis of the relevant preoperative ALT imaging literature. Methods Studies related to preoperative CDU and CTA imaging were reviewed, and information related to imaging method, sensitivity, false-positive rates, and perforator course identification (musculocutaneous vs. septocutaneous) were analyzed. Results A total of 23 studies related to preoperative ALT flap CDU and CTA imaging were included for review and analysis. Intraoperative perforator identification was compared with those found preoperatively using CDU (n = 672) and CTA (n = 531). Perforator identification sensitivity for CDU was 95.3% (95% CI: 90.9–97.6%) compared with the CTA sensitivity of 90.4% (95% confidence interval [CI]: 74.4–96.9%). The false-positive rate for CDU was 2.8% (95% CI: 1.1–4.5%) compared with 2.4% (95% CI: 0.7–4.1%) for CTA. Accuracy of perforator course identification was 95.5% (95% CI: 93.6–99.2%) for CDU and 96.9% (95% CI: 92.7–100.1%) for CTA. Conclusion CDU provides the reconstructive surgeon with greater preoperative perforator imaging sensitivity compared with CTA; however, false-positive rates are marginally higher with preoperative CDU. Preoperative imaging for ALT flap design is an effective tool, and the reconstructive surgeon should consider the data presented here when selecting a flap imaging modality.

Color transcranial “power” Doppler ultrasound of intracranial aneurysms

1996 ◽  
Vol 84 (3) ◽  
pp. 459-461 ◽  
Author(s):  
Joanna M. Wardlaw ◽  
James C. Cannon
Keyword(s):  
Doppler Ultrasound ◽  
Intracranial Aneurysms ◽  
Flow Direction ◽  
Color Doppler ◽  
Power Doppler ◽  
Color Doppler Imaging ◽  
Color Doppler Ultrasound ◽  
Doppler Imaging ◽  
Ultrasound Technique ◽  
Content Type

✓ “Color Doppler energy” (or “power Doppler”), a new color Doppler ultrasound technique that is independent of flow direction and very sensitive to movement, was assessed for its use in the identification of intracranial aneurysms in patients with recent subarachnoid hemorrhage immediately prior to using cerebral angiography. Features that identified aneurysms using this technique included the appearance of abnormal color where no normal artery was expected, abnormal bulging of an artery, and greater “expansibility” of the aneurysm in comparison to an adjacent normal vessel. In this exploratory study, 30 of 33 aneurysms were correctly identified in 35 patients with a good bone window. Color Doppler energy is considerably more sensitive to intracranial blood flow than conventional color Doppler imaging. Color Doppler energy is a useful research tool; if these preliminary results are verified in larger series, in addition to examination for vasospasm, the technique could be used for identification and follow up of aneurysms.

scholarly journals Validation of color Doppler ultrasound and computed tomography in the radiologic assessment of non-malignant acute splanchnic vein thrombosis

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261499
Author(s):  
Lukas Sturm ◽  
Dominik Bettinger ◽  
Christoph Klinger ◽  
Tobias Krauss ◽  
Hannes Engel ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Portal Vein ◽  
Doppler Ultrasound ◽  
Gold Standard ◽  
Color Doppler ◽  
Color Doppler Ultrasound ◽  
Splanchnic Vein Thrombosis ◽  
Vein Thrombosis ◽  
Cohen's Kappa ◽  
Radiologic Assessment

Introduction International guidelines propose color Doppler ultrasound (CDUS) and contrast-enhanced computed tomography (CT) as primary imaging techniques in the diagnosis of acute splanchnic vein thrombosis. However, their reliability in this context is poorly investigated. Therefore, the aim of our study was to validate CDUS and CT in the radiologic assessment of acute splanchnic vein thrombosis, using direct transjugular spleno-portography as gold standard. Materials and methods 49 patients with non-malignant acute splanchnic vein thrombosis were included in a retrospective, multicenter analysis. The thrombosis’ extent in five regions of the splanchnic venous system (right and left intrahepatic portal vein, main trunk of the portal vein, splenic vein, superior mesenteric vein) and the degree of thrombosis (patent, partial thrombosis, complete thrombosis) were assessed by portography, CDUS and CT in a blinded manner. Reliability of CDUS and CT with regard to portography as gold standard was analyzed by calculating Cohen’s kappa. Results Results of CDUS and CT were consistent with portography in 76.6% and 78.4% of examinations, respectively. Cohen’s kappa demonstrated that CDUS and CT delivered almost equally reliable results with regard to the portographic gold standard (k = 0.634 [p < 0.001] vs. k = 0.644 [p < 0.001]). In case of findings non-consistent with portography there was no clear trend to over- or underestimation of the degree of thrombosis in both CDUS (60.0% vs. 40.0%) and CT (59.5% vs. 40.5%). Conclusions CDUS and CT are equally reliable tools in the radiologic assessment of non-malignant acute splanchnic vein thrombosis.

scholarly journals Comparative Study of Three Preoperative Imaging Modalities for the Evaluation and Design of Superficial Circumflex Iliac Artery Perforator Flap: Color Doppler Ultrasound, Computed Tomography Angiography and Magnetic Resonance Angiography

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
Zhuowei Tian ◽  
Shizhe Wang ◽  
Yue He ◽  
Chunyue Ma
Keyword(s):  
Computed Tomography ◽  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Iliac Artery ◽  
Computed Tomography Angiography ◽  
Color Doppler ◽  
Vascular Anatomy ◽  
Color Doppler Ultrasound ◽  
Tof Mra ◽  
Artery Perforator

Background: Superficial circumflex iliac artery perforator (SCIP) flap is a promising reconstructive candidate for head and neck, trunk and extremity reconstruction. In order to reduce intraoperative errors, preoperative planning is essential for evaluation of the possible variations in vascular anatomy of the groin region. However, the use of these modalities has not been compared. Objectives: The three commonly used imaging modalities [color Doppler ultrasound (CDUS), computed tomography angiography (CTA), and magnetic resonance angiography (MRA)] were therefore compared in this study for the relative accuracy in the SCIP flap planning. Patients and Methods: This study was conducted on eight patients who underwent CDUS, CTA and MRA [3-dimensional time-of-flight magnetic resonance angiography, (3D TOF-MRA)] and received reconstructions with the SCIP flaps for head and neck defects. The perforators’ locations, courses and calibers were measured or marked for each flap. These imaging preoperative measurements were later compared with intraoperative findings. Results: CDUS, CTA and 3D TOF-MRA were able to effectively identify the courses of the perforators. 3D TOF-MRA was more accurate at measuring the pedicle calibers of SCIP flaps in comparison with CTA and CDUS. Conclusion: Three D-TOF-MRA may be a more valuable imaging modality for the preoperative assessment of the vascular anatomy of SCIP flaps.

scholarly journals Jugular Venous Reflux Is Associated with Perihematomal Edema after Intracerebral Hemorrhage

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Hao Feng ◽  
Hongxia Zhang ◽  
Wen He ◽  
Jian Zhou ◽  
Xingquan Zhao
Keyword(s):  
Computed Tomography ◽  
Intracerebral Hemorrhage ◽  
Color Doppler ◽  
Color Doppler Ultrasound ◽  
Venous Reflux ◽  
Hematoma Volume ◽  
Brain Computed Tomography ◽  
Perihematomal Edema ◽  
Jugular Venous Reflux

The purpose of this study was to determine whether jugular venous reflux (JVR) is associated with perihematomal edema (PHE) in individuals with intracerebral hemorrhage (ICH). Patients with spontaneous supratentorial ICH within 72 h of symptom onset were enrolled. Baseline brain computed tomography (CT) scan was performed, with a follow-up CT examination at 12 ± 3 days after onset. Jugular venous color Doppler ultrasound was performed at 12 ± 3 days after onset to examine the JVR status. A total of 65 patients with ICH were enrolled. In logistic regression analysis, absolute PHE volume was significantly associated with JVR (OR, 5.46; 95% CI, 1.04–28.63; p=0.044) and baseline hematoma volume (OR, 1.14; 95% CI, 1.03–1.26; p=0.009) within 72 h of onset. It was also correlated with JVR (OR, 15.32; 95% CI, 2.52–92.99; p=0.003) and baseline hematoma volume (OR, 1.14; 95% CI, 1.04–1.24; p=0.006) at 12 ± 3 days after onset. In a similar manner, relative PHE volume was significantly associated with JVR (OR, 14.85; 95% CI, 3.28–67.17; p<0.001) within 72 h of onset and at 12 ± 3 days after onset (OR, 5.87; 95% CI, 1.94–17.77; p=0.002). JVR is associated with both absolute and relative PHE volumes after ICH.

scholarly journals Head and Neck Veins of the Mouse. A Magnetic Resonance, Micro Computed Tomography and High Frequency Color Doppler Ultrasound Study

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0129912 ◽  
Author(s):  
Marcello Mancini ◽  
Adelaide Greco ◽  
Enrico Tedeschi ◽  
Giuseppe Palma ◽  
Monica Ragucci ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Magnetic Resonance ◽  
Head And Neck ◽  
Doppler Ultrasound ◽  
High Frequency ◽  
Color Doppler ◽  
Color Doppler Ultrasound ◽  
Micro Computed Tomography ◽  
Ultrasound Study
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