Circulatory Dynamics during the Early Arterial Phase

2015 ◽  
pp. 470-475
Author(s):  
K. Shimizu
Keyword(s):  
Arterial Phase ◽  
Circulatory Dynamics ◽  
Early Arterial Phase

Analisis Informasi Citra Anatomi Vaskular dengan Multi Planar Reformating (MPR) dan Maximum Intensity Projection (MIP) pada Fase Early Arteri Pemeriksaan MSCT Abdomen

2017 ◽  
Vol 3 (2) ◽  
pp. 240-244
Author(s):  
Ratna Istiningrum ◽  
Fatimah Fatimah ◽  
Tri Wulanhandarini
Keyword(s):  
Maximum Intensity Projection ◽  
Arterial Phase ◽  
P Value ◽  
Post Processing ◽  
Test Analysis ◽  
Vascular Abnormalities ◽  
Kappa Test ◽  
Anatomical Image ◽  
Parametric Statistical Test ◽  
Early Arterial Phase

Background: The development in the field of image reconstruction is growing rapidly along with the development of  CT Scan. In  the early stages of  MSCT abdominal artery is usually found  various kinds of vascular abnormalities such as stenosis, aneurism and others. Post processing image techniques commonly used include MPR and MIP. The purpose of this study is to determine whether there is a difference between MPR and MIP techniques and to know which one is better between the two.Methods: This  research was  quantitative study with experimental approach. The study was conducted at Bhakti Dharma Husada Surabaya Hospital  with 15 samples by performing reconstruction on vascular anatomical image of coronal examination of  abdominal MSCT. Assessment of anatomical information data is done by 2 respondents. Data analysis was done by kappa test followed by Wilcoxon sign rank test.Result : The results showed the difference between the post-processing of MIP and MPR on the coronal stages of the early arterial phase of the abdominal MSCT examination, based on the results of  non-parametric statistical test analysis (Wilcoxon) showed  a significant value of p value = 0.001. The result of MIP mean rank value (8,46) is higher than the mean rank value of MPR (1,50), it can be known that post proceeding MIP technique on coronal phase cuts early arterial examination of abdominal MSCT produces better anatomical image information.Conclusion: On examination of abdominal MSCT in the early arterial phase should be at the time of processing the image is also done by using post-processing MIP because more clearly than the MPR.

scholarly journals Adequacy of an early arterial phase low-volume contrast protocol in 64-detector computed tomography angiography for aortoiliac aneurysms

2008 ◽  
Vol 47 (3) ◽  
pp. 492-498 ◽  
Author(s):  
Nicolas Diehm ◽  
Constantino Pena ◽  
James F. Benenati ◽  
Athanassios I. Tsoukas ◽  
Barry T. Katzen
Keyword(s):  
Computed Tomography ◽  
Computed Tomography Angiography ◽  
Arterial Phase ◽  
Low Volume ◽  
Early Arterial Phase

scholarly journals Evaluation of the liver with virtual non-contrast: single institution study in 149 patients undergoing TAVR planning

2020 ◽  
Vol 93 (1106) ◽  
pp. 20190701 ◽  
Author(s):  
Kai Roman Laukamp ◽  
Simon Lennartz ◽  
Vivian Ho ◽  
Nils Große Hokamp ◽  
David Zopfs ◽  
...  
Keyword(s):  
Contrast Media ◽  
Abdominal Aorta ◽  
Region Of Interest ◽  
Hounsfield Unit ◽  
Liver Parenchyma ◽  
Arterial Phase ◽  
Single Institution ◽  
Transcatheter Aortic Valve ◽  
Spectral Detector Ct ◽  
Early Arterial Phase

Objective: To evaluate accuracy of virtual-non-contrast images (VNC) compared to true-unenhanced-images (TNC) for evaluation of liver attenuation acquired using spectral-detector CT (SDCT). Methods: 149 patients who underwent multiphase transcatheter-aortic-valve-replacement (TAVR) SDCT-examinations [unenhanced-chest (TNC), CT-angiography chest (CTA-chest, early arterial-phase) and abdomen (CTA-abdomen, additional early arterial-phase after a second injection of contrast media)] were retrospectively included. VNC of CTA-chest (VNC-chest) and CTA-abdomen (VNC-abdomen) were reconstructed and compared to TNC. Region of interest-based measurement of mean attenuation (Hounsfield unit, HU) was applied in the following regions: liver, spleen, abdominal aorta and paraspinal muscle. Results: VNC accuracy was high in the liver, spleen, abdominal aorta and muscle for abdomen-scanning. For the liver, average attenuation was 59.0 ± 9.1 HU for TNC and 72.6 ± 9.5 HU for CTA-abdomen. Liver attenuation in VNC-abdomen (59.1 ± 6.4 HU) was not significantly different from attenuation in TNC (p > 0.05). In contrast, VNC was less accurate for chest-scanning: Due to the protocol, in CTA-chest no contrast media was present in the liver parenchyma as indicated by the same attenuation in TNC (59.0 ± 9.1 HU) and CTA-chest (58.8 ± 8.9 HU, p > 0.05). Liver attenuation in VNC-chest (56.2 ± 6.4 HU, p < 0.05) was, however, significantly lower than in TNC and CTA-chest implying an artificial reduction of attenuation. Conclusion: VNC performed well in a large cohort of TAVR-examinations yielding equivalent mean attenuations to TNC; however, application of this technique might be limited when no or very little contrast media is present in parenchyma, more precisely in an early arterial-phase of the liver. Advances in knowledge: This study showed that VNC can be reliably applied in cardiac protocols when certain limitations are considered

Contrast-Enhanced Ultrasound Findings in Patients with Rare Solitary Necrotic Nodule of the Liver – a Multicenter Report

2021 ◽  
Author(s):  
Giampiero Francica ◽  
Maria Franca Meloni ◽  
Laura Riccardi ◽  
Ilario de Sio ◽  
Eugenio Caturelli ◽  
...  
Keyword(s):  
Liver Disease ◽  
Chronic Liver Disease ◽  
Incidental Finding ◽  
Chronic Liver ◽  
Arterial Phase ◽  
Contrast Enhanced Ultrasound ◽  
Diagnostic Modality ◽  
Contrast Enhanced ◽  
Early Arterial Phase

Abstract Purpose This multicenter retrospective study highlights the contrast-enhanced ultrasound (CEUS) findings in a series of histologically proven solitary necrotic nodules (SNN) of the liver, a poorly understood pathologic entity of uncertain origin that mimics malignancy. Materials and Methods 22 patients (M/F 13/9; mean age 59.4 years, SD ± 10.7, range 35–81) with histological diagnosis of SNN and CEUS were selected from clinical, imaging, and pathological archives of 7 US interventional centers, each of which provided 1 to 6 cases (mean 2.8). Pathological diagnosis was made on 20 US-guided biopsies and 2 surgical specimens. 2 patients had 2 SNNs with identical CEUS findings so that imaging analysis was carried out on 24 nodules. Results SNN was an incidental finding in healthy people in 10 cases (45.5 %), and it was discovered during follow-up for either known extrahepatic malignancies (9 cases = 41 %) or chronic liver disease (3 cases = 13.5 %). SNNs had a mean size of 19.3 mm (SD ± 6.5, range 9–40). On B-mode US, SNNs appeared hypoechoic in 14 cases (66.7 %), “target-like” in 7 cases (29.2 %), and homogeneously hyperechoic in 1 case (4.1 %). On CEUS, all lesions appeared devoid of contrast enhancement (“punched out” aspect) in the arterial, portal venous, and late phases after US contrast agent injection. A uniformly thin, hyperenhancing ring in the early arterial phase and isoenhanced with the surrounding parenchyma in the portal venous and late phases was found in 10 nodules (41.6 %). Clinical and imaging follow-up (mean duration 42.2 months, SD ± 34.9, range 2–108) was available in 15 patients with 16 SNNs: no changes in size and echostructure were seen. Conclusion CEUS can contribute to the diagnosis of SNN when a “punched out” appearance in all vascular phases with or without thin rim enhancement in the very early arterial phase is present in healthy subjects in whom a focal liver lesion is incidentally found. In patients with a history of chronic liver disease or malignancy, US-guided biopsy represents the unavoidable first-line diagnostic modality.

scholarly journals Regression of Hypervascular Nodules in a Patient with Wilson's Disease Awaiting Liver Transplantation

2009 ◽  
Vol 2009 ◽  
pp. 1-4
Author(s):  
Alcindo Pissaia ◽  
Hervé Gouya ◽  
Olivier Scatton ◽  
Filoména Conti ◽  
Yvon Calmus
Keyword(s):  
Liver Transplantation ◽  
Wilson’S Disease ◽  
Contrast Material ◽  
Wilson's Disease ◽  
Arterial Phase ◽  
Intravenous Contrast ◽  
Portal Venous Phase ◽  
Venous Phase ◽  
One Year ◽  
Early Arterial Phase

This paper describes the regressive course over one year of hypervascular nodules in a patient with Wilson's disease. CT revealed multiple, enhancing nodules (up to 3 cm in diameter) detected in the liver in the early arterial phase after the administration of intravenous contrast material. Most of these nodules became isodense in the portal venous phase. After one year of efficient therapy combining d-penicillamine and zinc acetate, most of the nodules had disappeared, while the liver contours had become more regular. To our knowledge, the regression of large hypervascular nodules has not previously been reported in patients with Wilson's disease.

scholarly journals Effectiveness of intraoperative indocyanine green videoangiography in direct surgical treatment of pediatric intracranial pial arteriovenous fistula

2015 ◽  
Vol 15 (1) ◽  
pp. 55-59 ◽  
Author(s):  
Tadashi Sugimoto ◽  
Young-Su Park ◽  
Ichiro Nakagawa ◽  
Fumihiko Nishimura ◽  
Yasushi Motoyama ◽  
...  
Keyword(s):  
Indocyanine Green ◽  
Arterial Phase ◽  
Left Middle Cerebral Artery ◽  
Indocyanine Green Videoangiography ◽  
Cerebrovascular Lesions ◽  
Developmental Problems ◽  
Arteriovenous Fistulas ◽  
Surgical Options ◽  
Pial Arteriovenous Fistula ◽  
Early Arterial Phase

Intracranial pial arteriovenous fistulas (AVFs) are rare cerebrovascular lesions. The authors report a rare case of pediatric pial AVF treated by direct disconnection with the aid of indocyanine green (ICG) videoangiography. A 3-year-old girl presented with developmental problems. Magnetic resonance imaging revealed brain atrophy and an anomalous left temporal vascular mass. Angiography showed a high-flow pial AVF in the early arterial phase fed by the M1 portion of the left middle cerebral artery and draining into the superficial sylvian vein and the vein of Trolard with a large varix. Given that her fistula was located in a superficial region that was easily accessible by craniotomy, the authors successfully disconnected her pial AVF by direct surgery aided by ICG videoangiography, which clearly confirmed the shunting point. In this report, the authors discuss the existing literature and compare the relative merits of endovascular versus surgical options for the treatment of pial AVF.

Hepatocellular Carcinoma: Depiction of Tumor Parenchymal Flow with Intermittent Harmonic Power Doppler US during the Early Arterial Phase in Dual-Display Mode

Radiology ◽  
2001 ◽  
Vol 220 (2) ◽  
pp. 349-356 ◽  
Author(s):  
Hong Ding ◽  
Masatoshi Kudo ◽  
Hirokazu Onda ◽  
Yoichiro Suetomi ◽  
Yasunori Minami ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Power Doppler ◽  
Arterial Phase ◽  
Doppler Us ◽  
Display Mode ◽  
Harmonic Power ◽  
Early Arterial Phase

Determining the Optimal Timing for Early Arterial Phase Hepatic CT Imaging by Measuring Abdominal Aortic Enhancement in Variable Contrast Injection Protocols

2006 ◽  
Vol 30 (2) ◽  
pp. 206-211 ◽  
Author(s):  
Takamichi Murakami ◽  
Hiromitsu Onishi ◽  
Koji Mikami ◽  
Riccardo Iannaccone ◽  
Michael P. Federle ◽  
...  
Keyword(s):  
Ct Imaging ◽  
Arterial Phase ◽  
Optimal Timing ◽  
Contrast Injection ◽  
Abdominal Aortic ◽  
Early Arterial Phase

Spiral CT of Hepatocellular Carcinoma: Correlation of CT Scans during the Arterial Phase with Angiography

1996 ◽  
Vol 34 (4) ◽  
pp. 507
Author(s):  
Han Kyung Lee ◽  
Byung Ihn Choi ◽  
Joon Koo Han ◽  
Dae Young Yoon ◽  
Jae Min Cho ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Spiral Ct ◽  
Ct Scans ◽  
Arterial Phase
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