scholarly journals The main criteria for ASL-perfusion of the liver in viral hepatitis

2021 ◽  
Vol 25 (1) ◽  
pp. 73-79
Author(s):  
T. G. Morozova ◽  
E. N. Simakina ◽  
T. D. Gelt
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Viral Hepatitis ◽  
Minimum Degree ◽  
Liver Perfusion ◽  
Reference Method ◽  
Abdominal Ultrasound ◽  
Liver Parenchyma ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri

Objective. Evaluate the main criteria for ASL-liver perfusion in viral hepatitis.Material and methods. 111 patients with viral hepatitis, including 69 (62.2%) men and 42 (37.8) women, were examined on the basis of “Clinical hospital N 1”, Smolensk. The average age of patients was 48 ± 5.4 years. All subjects (n = 111) underwent abdominal ultrasound with Doppler vascular examination, clinical elastography, and ASL-liver perfusion with magnetic resonance imaging (MRI). The reference method was trepan liver biopsy in 69 (62.1%) people.Results. Patients were observed for 9 months. A proportion of the prognosis of the course of the viral hepatitis was compiled, followed by a coefficient-PHBF/PABF, where PHBF is the coefficient of blood flow in the liver parenchyma, PABF is the blood flow in the hepatic artery or abdominal aorta. According to the results of observation of patients, it was found that 54 (48.6%) received more than 1, and 57 (51.3%) had a prognosis coefficient of less than 1. There was a high correlation between positive clinical and laboratory dynamics and an increase in ASL-perfusion of the liver (r = 0.889), as well as negative clinical and laboratory dynamics and a decrease in ASL-perfusion of the liver (r = 0.887). it was found that in patients with a minimum degree of VH activity, the volume of hepatic blood flow (HBF) according to ASL-perfusion of the liver during MRI was from 140 – 159 ml/100 g/min, with a moderate – 118–139 ml/100 g/min, with high – 40–117 ml/100 g/min.Conclusion. Thus, if the ratio of forecast of more than 1 predict a favorable course (AUC = 0,897 (95% CI 0,884– 0,951)), with a coefficient less than 1 is unfavorable (AUC = 0,895 (95% CI 0,881–0,953)). 

scholarly journals Giant Abdominal Lipoma in Adult

2021 ◽  
Vol 2021 ◽  
pp. 1-4
Author(s):  
Nihal Cinar Ozcan ◽  
Akay Edizsoy ◽  
Tahsin Colak
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Acute Abdomen ◽  
Abdominal Ultrasound ◽  
Abdominal Discomfort ◽  
Resonance Imaging ◽  
Abdominal Symptoms ◽  
Giant Lipoma ◽  
Magnetic Resonance Imaging Mri

Lipomas arising from the omentum are extremely rare in adults. Omental lipomas are typically asymptomatic, but very large ones may cause nonspecific abdominal symptoms and discomfort. Rarely they can cause omental torsion and present with an acute abdomen. We report a 41-year-old female patient with a giant lipoma ( 40 × 26 × 8   cm and 11,520 g) who presented with mild abdominal discomfort. Workup included abdominal ultrasound (USG) and magnetic resonance imaging (MRI). Surgical resection was performed without complication. No recurrence was observed during 4-year follow-up.

Liver perfusion in dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI): comparison of enhancement in Gd-BT-DO3A and Gd-EOB-DTPA in normal liver parenchyma

2014 ◽  
Vol 24 (9) ◽  
pp. 2146-2156 ◽  
Author(s):  
Hanke J. Schalkx ◽  
Marijn van Stralen ◽  
Kenneth Coenegrachts ◽  
Maurice A. A. J. van den Bosch ◽  
Charlotte S. van Kessel ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Liver Perfusion ◽  
Normal Liver ◽  
Liver Parenchyma ◽  
Resonance Imaging ◽  
Dce Mri ◽  
Dynamic Contrast Enhanced ◽  
Normal Liver Parenchyma ◽  
Contrast Enhanced

Cross-Sectional Deformation of the Aorta as Measured With Magnetic Resonance Imaging

1998 ◽  
Vol 120 (1) ◽  
pp. 18-21 ◽  
Author(s):  
M. R. Moreno ◽  
J. E. Moore ◽  
R. Meuli
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Flow Patterns ◽  
Myocardial Contraction ◽  
Resonance Imaging ◽  
Cross Sectional ◽  
Magnetic Resonance Imaging Mri ◽  
Sectional Shape ◽  
Blood Flow Patterns

Vessel geometry is commonly accepted as one of the primary factors influencing blood flow patterns. The vessels near the heart present a particular challenge because myocardial contraction creates dynamic changes in vessel geometry due to the movement created by the contraction of the myocardial muscle. The importance of vessel movement and deformation on blood flow patterns in the coronary arteries has been previously demonstrated. For larger vessels such as the aorta, the effects are less well understood, partially because no estimates of the dynamic variations in vessel cross section shape geometry have been reported. This study was undertaken to provide an estimate of the amount of dynamic variation in cross-sectional shape present in the aorta. Two young healthy male subjects were used, with measurements taken in the ascending aorta, aortic arch, and descending thoracic aorta using Magnetic Resonance Imaging (MRI). The magnitude of elliptical deformation was measured throughout the cardiac cycle by taking a discrete Fourier transform of the radius versus angle plot. Deformations of more than 7 percent of the mean vessel radius were noted. This level of deformation may be enough to influence flow patterns in the aorta significantly, and thus should be included in future flow studies.

scholarly journals Bilateral subdiaphragmatic kidneys with right-sided renal malrotation

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Al Shaimaa Fathi Elshetry
Keyword(s):  
Magnetic Resonance Imaging ◽  
Anatomical Variation ◽  
Abdominal Ultrasound ◽  
Resonance Imaging ◽  
Renal Anomalies ◽  
Case Presentation ◽  
Renal Ectopia ◽  
Abdominal Magnetic Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Radiological Examinations

Abstract Background The subdiaphragmatic kidney is a positional variant of the uncommon cephalad renal ectopia, whereas renal malrotation refers to the anomalous renal hilar position. Both anomalies are rare, possibly under-reported, discovered incidentally on radiological examinations since patients are often asymptomatic. Case presentation This case report presents a unique renal anatomical variation in a 71-year-old female patient. A bilateral subdiaphragmatic renal ectopia coupled with right-sided renal malrotation, discovered accidentally on abdominal ultrasound (US), and confirmed by abdominal magnetic resonance imaging (MRI). Conclusions The presented case of bilateral subdiaphragmatic kidneys associated with right-sided renal malrotation is rare and not previously described in the literature. Radiologists must be familiar with these renal anomalies that can be discovered on imaging performed for other indications. MRI can provide more anatomical data compared to US.

scholarly journals Four-Dimensional Flow Magnetic Resonance Imaging and Applications in Cardiology

2021 ◽  
Author(s):  
Patrick Geeraert ◽  
Hansuk Kim ◽  
Safia Ihsan Ali ◽  
Ashifa Hudani ◽  
Shirin Aliabadi ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
4D Flow Mri ◽  
4D Flow ◽  
Great Vessels ◽  
Flow Mri ◽  
Magnetic Resonance Imaging Mri

Blood flow through the heart and great vessels moves in three dimensions (3D) throughout time. However, the assessment of its 3D nature has been limited in the human body. Recent advances in magnetic resonance imaging (MRI) allow for the comprehensive visualization and quantification of in-vivo flow dynamics using four-dimensional (4D) flow MRI. In addition, this technique provides the opportunity to obtain advanced hemodynamic biomarkers such as vorticity, helicity, wall shear stress (WSS), pressure gradients, viscous energy loss (EL), and turbulent kinetic energy (TKE). This chapter will introduce 4D flow MRI which is currently used for blood flow visualization and advanced quantification of cardiac hemodynamic biomarkers. We will discuss its advantages relative to other in-vivo flow imaging techniques and describe its potential clinical applications in cardiology.

Functional Magnetic Resonance Imaging Measures of Blood Flow Patterns in the Human Auditory Cortex in Response to Sound

1998 ◽  
Vol 41 (3) ◽  
pp. 538-548 ◽  
Author(s):  
Sean C. Huckins ◽  
Christopher W. Turner ◽  
Karen A. Doherty ◽  
Michael M. Fonte ◽  
Nikolaus M. Szeverenyi
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Speech Stimuli ◽  
Complex Stimuli ◽  
Scanning Session ◽  
Auditory Research

Functional Magnetic Resonance Imaging (fMRI) holds exciting potential as a research and clinical tool for exploring the human auditory system. This noninvasive technique allows the measurement of discrete changes in cerebral cortical blood flow in response to sensory stimuli, allowing determination of precise neuroanatomical locations of the underlying brain parenchymal activity. Application of fMRI in auditory research, however, has been limited. One problem is that fMRI utilizing echo-planar imaging technology (EPI) generates intense noise that could potentially affect the results of auditory experiments. Also, issues relating to the reliability of fMRI for listeners with normal hearing need to be resolved before this technique can be used to study listeners with hearing loss. This preliminary study examines the feasibility of using fMRI in auditory research by performing a simple set of experiments to test the reliability of scanning parameters that use a high resolution and high signal-to-noise ratio unlike that presently reported in the literature. We used consonant-vowel (CV) speech stimuli to investigate whether or not we could observe reproducible and consistent changes in cortical blood flow in listeners during a single scanning session, across more than one scanning session, and in more than one listener. In addition, we wanted to determine if there were differences between CV speech and nonspeech complex stimuli across listeners. Our study shows reproducibility within and across listeners for CV speech stimuli. Results were reproducible for CV speech stimuli within fMRI scanning sessions for 5 out of 9 listeners and were reproducible for 6 out of 8 listeners across fMRI scanning sessions. Results of nonspeech complex stimuli across listeners showed activity in 4 out of 9 individuals tested.

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