Purpose: To directly compare and study the variability of parameters related to hepatic blood flow measurements using 3 T phase-contrast magnetic resonance imaging (PC-MRI) and Doppler ultrasound (US).
Materials And Methods: Nine healthy subjects were studied. Blood velocities and flow rate measurements were performed in the portal vein and the proper hepatic artery. MR studies were performed using a 3 T imager. Gradient-echo fast phase contrast sequences were used with both cardiac and respiratory gating. MR and Doppler flow parameters were extracted and compared. Two methods of calculation were used for Doppler flow rate analysis.
Results: Compared to Doppler US, PC-MRI largely underestimated hepatic flow data with lower variability and higher reproducibility. This reproducibility was more pronounced in the portal vein than in the proper hepatic artery associated with poorer velocity correlations. Total hepatic flow values were 1239 +/- 223 mL/min and 1595 +/- 521 mL/min for PC-MRI and Doppler US, respectively.
Conclusion: Free-breathing PC-MRI can provide reliable noninvasive measurement of hepatic flow parameters compared to Doppler US. The MR technique could help to improve Doppler flow calculations, thereby allowing standardization of protocols, particularly for applications in disease.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/jmri.22079 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The role of intestinal ultrasound with colour Doppler in predicting the response to biologic therapy in inflammatory bowel disease patients.
Prz Gastroenterol
November 2023
Department of Internal Medicine, Hepato-gastroenterology Unit, Faculty of Medicine, Assiut University, Assiut, Egypt.
Introduction: Inflammatory bowel disease patients are exposed to frequent procedures and hospital admissions as well as recurrent need for radiological examinations with a high risk of exposure to radiation and contrast.
Aim: Our objective was to evaluate the role of a combination of both intestinal ultrasound (IUS) and colour Doppler with different parameters for monitoring changes in inflammation over time and to reveal their potential role in the assessment of response to biologic therapy in inflammatory bowel disease (IBD) patients.
Material And Methods: Before the induction of biological therapy, IUS together with colour Doppler of the intestine was conducted.
Ultrafast Coherence-Based Power Doppler Estimation Using Nonlinear Compounding With Complementary Subset Transmit.
Ultrasound Med Biol
January 2025
Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
Objective: Conventional coherent plane wave compounding (CPWC) and sum-of-square power Doppler (PD) estimation lead to low contrast and high noise level in ultrafast PD imaging when the number of plane-wave angle and the ensemble length is limited. The coherence-based PD estimation using temporal-multiply-and-sum (TMAS) of high-lag autocorrelation can effectively suppress the uncorrelated noises but at the cost of signal power due to the blood flow decorrelation.
Methods: In this study, the TMAS PD estimation is incorporated with complementary subset transmit in nonlinear compounding (DMAS-CST) to leverage the signal coherence in both angular and temporal dimensions for improvement of PD image quality.
Identification of the Greater Palatine Foramen, the Greater Palatine Artery, and Palatal Fibromucosa: A Cross-Sectional Ultrasonographic Clinical Study.
J Stomatol Oral Maxillofac Surg
January 2025
Professor, Department of Oral, Dental and Maxillofacial Radiology, Faculty of Dentistry, Ataturk University, Erzurum, 25240, Turkiye.
Objectives: This study aimed to evaluate with ultrasonography (US) the location of GPF, the course of the GPA, and to measure palatal fibromucosa thickness.
Materials And Methods: This in vivo experiment was conducted on a group of healthy, young Turkish subjects. Using the US, the localization of the GPF, its diameter and opening type, maximum flow velocity (Vmax) and collateral branches (CB) of the GPA, and the thickness of the palatine mucosa were evaluated.
L-theanine promotes angiogenesis in limb ischemic mice by modulating NRP1/VEGFR2 signaling.
Biomol Biomed
January 2025
Department of Cardiology of The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China; State Key Laboratory of Transvascular Implantation Devices, Hangzhou, China; Cardiovascular Key Laboratory of Zhejiang Province, Hangzhou, China.
Peripheral artery disease (PAD), primarily caused by atherosclerosis, leads to the narrowing or blockage of arteries that supply blood to the limbs. This study explores the pro-angiogenic effects of L-theanine and its underlying mechanisms in a mouse model of hindlimb ischemia (HLI). To evaluate L-theanine's pro-angiogenic effects, human umbilical vein endothelial cells (HUVECs) were subjected to tube formation, migration, sprouting, and proliferation assays.
View Article and Find Full Text PDFTranscranial Doppler Arterial Pressure Gradient Is Associated With Delayed Infarction After Subarachnoid Hemorrhage.
J Neuroimaging
January 2025
Department of Neurology, Georgetown University School of Medicine, Washington, District of Columbia, USA.
Background And Purpose: While the pulsatility index (PI) measured by transcranial Doppler (TCD) has broader associations with outcomes in neurocritical care, its use in monitoring delayed cerebral infarction (DCI) in patients with aneurysmal subarachnoid hemorrhage (SAH) is not endorsed by current clinical guidelines. Recognizing that arterial pressure gradient (ΔP) can be estimated using PI, we investigated the potential significance of TCD-estimated ΔP.
Methods: In this observational study of 186 SAH patients, we recorded the mean cerebral blood flow velocity (mCBFV) and PI values from the middle cerebral artery, along with corresponding blood pressures.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!