keyword
https://read.qxmd.com/read/38536448/arterial-spin-labelling-magnetic-resonance-imaging-and-perfusion-patterns-in-neurocognitive-and-other-mental-disorders-a-systematic-review
#1
REVIEW
Rita Ferreira, António J Bastos-Leite
We reviewed 33 original research studies assessing brain perfusion, using consensus guidelines from a "white paper" issued by the International Society for Magnetic Resonance in Medicine Perfusion Study Group and the European Cooperation in Science and Technology Action BM1103 ("Arterial Spin Labelling Initiative in Dementia"; https://www.cost.eu/actions/BM1103/ ). The studies were published between 2011 and 2023 and included participants with subjective cognitive decline plus; neurocognitive disorders, including mild cognitive impairment (MCI), Alzheimer's disease (AD), frontotemporal lobar degeneration (FTLD), dementia with Lewy bodies (DLB) and vascular cognitive impairment (VCI); as well as schizophrenia spectrum disorders, bipolar and major depressive disorders, autism spectrum disorder, attention-deficit/hyperactivity disorder, panic disorder and alcohol use disorder...
March 27, 2024: Neuroradiology
https://read.qxmd.com/read/38529464/can-currently-available-non-invasive-continuous-blood-pressure-monitors-replace-invasive-measurement-with-an-arterial-catheter
#2
REVIEW
Payton Gore, Hong Liu, Christian Bohringer
Deviations from normal blood pressure (BP) during general anesthesia have been clearly linked to several adverse outcomes. Measuring BP accurately is therefore critically important for producing excellent outcomes in health care. Normal BP does not necessarily guarantee adequate organ perfusion however and adverse events have occurred even when BP seemed adequate. Invasive blood pressure monitoring has recently evolved beyond merely measuring BP. Arterial line-derived pulse contour analysis is used now to assess both cardiac output and stroke volume variation as indices of adequate intravascular volume...
February 2024: Curēus
https://read.qxmd.com/read/38528871/comparison-of-computed-tomography-perfusion-and-magnetic-resonance-dynamic-susceptibility-contrast-perfusion-weighted-imaging-in-canine-brain
#3
JOURNAL ARTICLE
Sangmin Lee, Soomin Park, Sungwha Hong, Soyeon Kim, Junghee Yoon, Jihye Choi
Brain perfusion allows for the evaluation of cerebral hemodynamics, particularly in brain infarcts and tumors. Computed tomography (CT) perfusion (CTP) provides reliable data; however, it has a limited scan field of view and radiation exposure. Magnetic resonance (MR) perfusion provides detailed imaging of small structures and a wide scan field of view. However, no study has compared CTP and MR perfusion and assessed the correlation between the perfusion parameters measured using CTP and MR perfusion. The aim of the present study was to assess the correlation and agreement of the cerebral perfusion derived from dynamic susceptibility contrast (DSC)-MRI and CTP in dogs...
2024: Frontiers in Veterinary Science
https://read.qxmd.com/read/38528780/ct-perfusion-based-rcbf-38-volume-is-independently-and-negatively-associated-with-digital-subtraction-angiography-collateral-score-in-anterior-circulation-large-vessel-occlusions
#4
JOURNAL ARTICLE
Dhairya A Lakhani, Aneri B Balar, Manisha Koneru, Sijin Wen, Burak Berksu Ozkara, Richard Wang, Meisam Hoseinyazdi, Mehreen Nabi, Ishan Mazumdar, Andrew Cho, Kevin Chen, Sadra Sepehri, Nathan Hyson, Risheng Xu, Victor Urrutia, Licia Luna, Argye E Hillis, Jeremy J Heit, Greg W Albers, Ansaar T Rai, Vivek S Yedavalli
BACKGROUND: Collateral status (CS) is an important biomarker of functional outcomes in patients with acute ischemic stroke secondary to large vessel occlusion (AIS-LVO). Pretreatment CT perfusion (CTP) parameters serve as reliable surrogates of collateral status (CS). In this study, we aim to assess the relationship between the relative cerebral blood flow less than 38% (rCBF <38%), with the reference standard American Society of Interventional and Therapeutic Neuroradiology (ASITN) collateral score (CS) on DSA...
March 25, 2024: Neuroradiology Journal
https://read.qxmd.com/read/38526586/flat-panel-detector-perfusion-imaging-and-conventional-multidetector-perfusion-imaging-in-patients-with-acute-ischemic-stroke-a-comparative-study
#5
JOURNAL ARTICLE
Bettina L Serrallach, Adnan Mujanovic, Nikolaos Ntoulias, Michael Manhart, Mattia Branca, Alex Brehm, Marios-Nikos Psychogios, Christoph C Kurmann, Eike I Piechowiak, Sara Pilgram-Pastor, Thomas Meinel, David Seiffge, Pasquale Mordasini, Jan Gralla, Tomas Dobrocky, Johannes Kaesmacher
PURPOSE: Flat-panel detector computed tomography (FDCT) is increasingly used in (neuro)interventional angiography suites. This study aimed to compare FDCT perfusion (FDCTP) with conventional multidetector computed tomography perfusion (MDCTP) in patients with acute ischemic stroke. METHODS: In this study, 19 patients with large vessel occlusion in the anterior circulation who had undergone mechanical thrombectomy, baseline MDCTP and pre-interventional FDCTP were included...
March 25, 2024: Clinical Neuroradiology
https://read.qxmd.com/read/38519901/comparison-of-asl-and-dsc-perfusion-methods-in-the-evaluation-of-response-to-treatment-in-patients-with-a-history-of-treatment-for-malignant-brain-tumor
#6
JOURNAL ARTICLE
Ezgi Suat Bayraktar, Gokhan Duygulu, Yusuf Kenan Çetinoğlu, Mustafa Fazıl Gelal, Melda Apaydın, Hülya Ellidokuz
OBJECTIVE: Perfusion MRI is of great benefit in the post-treatment evaluation of brain tumors. Interestingly, dynamic susceptibility contrast-enhanced (DSC) perfusion has taken its place in routine examination for this purpose. The use of arterial spin labeling (ASL), a perfusion technique that does not require exogenous contrast material injection, has gained popularity in recent years. The aim of the study was to compare two different perfusion techniques, ASL and DSC, using qualitative and quantitative measurements and to investigate the diagnostic effectiveness of both...
March 22, 2024: BMC Medical Imaging
https://read.qxmd.com/read/38519444/the-role-of-fetal-hemoglobin-in-the-artificial-placenta-a-premature-ovine-model
#7
JOURNAL ARTICLE
Brianna L Spencer, Brian P Fallon, Jennifer S McLeod, Marie Cornell, Erin E Perrone, David M Manthei, Alvaro Rojas-Peña, Ronald B Hirschl, Robert H Bartlett, George B Mychaliska
INTRODUCTION: A radical paradigm shift in the treatment of premature infants failing conventional treatment is to recreate fetal physiology using an extracorporeal Artificial Placenta (AP). The aim of this study is to evaluate the effects of changing fetal hemoglobin percent (HbF%) on physiology and circuit function during AP support in an ovine model. METHODS: Extremely premature lambs ( n = 5) were delivered by cesarean section at 117-121 d estimated gestational age (EGA) (term = 145d), weighing 2...
March 22, 2024: Perfusion
https://read.qxmd.com/read/38513786/diffusion-derived-vessel-density-ddvd-computed-from-a-simple-diffusion-mri-protocol-as-a-biomarker-of-placental-blood-circulation-in-patients-with-placenta-accreta-spectrum-disorders-a-proof-of-concept-study
#8
JOURNAL ARTICLE
Tao Lu, Li Wang, Mou Li, Yishuang Wang, Meining Chen, Ben-Heng Xiao, Yì Xiáng J Wáng
OBJECTIVES: Increasing trend of PAS (placenta accreta spectrum disorders) incidence is a major health concern as PAS is associated with high maternal morbidity and mortality during cesarean section. Prenatal identification of PAS is crucial for delivery planning and patients management. This study aims to explore whether diffusion-derived vessel density (DDVD) computed from a simple diffusion MRI protocol differs in PAS from normal placenta. METHODS: We enrolled 86 patients with PAS disorders and 40 pregnant women without PAS disorders...
March 19, 2024: Magnetic Resonance Imaging
https://read.qxmd.com/read/38507075/follow-up-infarct-volume-on-fluid-attenuated-inversion-recovery-flair-%C3%A2-imaging-in-distal-medium-vessel-occlusions-the-role-of-cerebral-blood-volume-index
#9
JOURNAL ARTICLE
Hamza Salim, Dhairya A Lakhani, Aneri Balar, Basel Musmar, Nimer Adeeb, Meisam Hoseinyazdi, Licia Luna, Francis Deng, Nathan Z Hyson, Janet Mei, Adam A Dmytriw, Adrien Guenego, Tobias D Faizy, Jeremy J Heit, Gregory W Albers, Victor C Urrutia, Raf Llinas, Elisabeth B Marsh, Argye E Hillis, Kambiz Nael, Vivek Yedavalli
BACKGROUND: Distal medium vessel occlusions (DMVOs) contribute substantially to the incidence of acute ischemic strokes (AIS) and pose distinct challenges in clinical management and prognosis. Neuroimaging techniques, such as Fluid Attenuation Inversion Recovery (FLAIR) imaging and cerebral blood volume (CBV) index derived from perfusion imaging, have significantly improved our ability to assess the impact of strokes and predict their outcomes. The primary objective of this study was to investigate relationship between follow-up infarct volume (FIV) as assessed by FLAIR imaging in patients with DMVOs...
March 20, 2024: Journal of Neurology
https://read.qxmd.com/read/38499758/feasibility-of-assessing-non-invasive-intracranial-compliance-using-fsi-simulation-based-and-mr-elastography-based-brain-stiffness
#10
JOURNAL ARTICLE
Seifollah Gholampour
Intracranial compliance (ICC) refers to the change in intracranial volume per unit change in intracranial pressure (ICP). Magnetic resonance elastography (MRE) quantifies brain stiffness by measuring the shear modulus. Our objective is to investigate the relationship between ICC and brain stiffness through fluid-structure interaction (FSI) simulation, and to explore the feasibility of using MRE to assess ICC based on brain stiffness. This is invaluable due to the clinical importance of ICC, as well as the fast and non-invasive nature of the MRE procedure...
March 18, 2024: Scientific Reports
https://read.qxmd.com/read/38498943/a-novel-approach-to-retrograde-autologous-priming-for-infant-pediatric-and-adult-populations-undergoing-congenital-heart-surgery
#11
JOURNAL ARTICLE
Joseph Deptula, Vincent Olshove, Molly Oldeen, Deborah Kozik, Bahaaldin Alsoufi
INTRODUCTION: Retrograde Autologous Priming (RAP) of cardiopulmonary bypass (CPB) circuits is an effective way to reduce prime volume, commonly through the transfer of prime into separate reservoirs or circuit manipulation. We describe a simple and safe technique for RAP without the need for any circuit modifications or manipulations. METHODS: For this technique, a separate roller pump for ultrafiltration (UF) is used. After adequate heparinization and arterial cannulation, the UF pump is initiated slowly, removing prime through the effluent of the UF, replacing with the patient's blood from the aortic cannula...
March 18, 2024: Perfusion
https://read.qxmd.com/read/38495722/measuring-pulsatile-cortical-blood-flow-and-volume-during-carotid-endarterectomy
#12
JOURNAL ARTICLE
Alexander I Zavriyev, Kutlu Kaya, Kuan Cheng Wu, Eric T Pierce, Maria Angela Franceschini, Mitchell B Robinson
Carotid endarterectomy (CEA) involves removal of plaque in the carotid artery to reduce the risk of stroke and improve cerebral perfusion. This study aimed to investigate the utility of assessing pulsatile blood volume and flow during CEA. Using a combined near-infrared spectroscopy/diffuse correlation spectroscopy instrument, pulsatile hemodynamics were assessed in 12 patients undergoing CEA. Alterations to pulsatile amplitude, pulse transit time, and beat morphology were observed in measurements ipsilateral to the surgical side...
March 1, 2024: Biomedical Optics Express
https://read.qxmd.com/read/38494968/-applied-anatomical-characteristics-of-vascularized-iliac-muscle-flap-and-its-clinical-application-in-repairing-oral-and-maxillofacial-defects
#13
JOURNAL ARTICLE
Yang Zhang, Qing-Hai Zhu, Yong-Jie Zhang, Chen-Xing Wang, Jin-Hai Ye
PURPOSE: To investigate the feasibility and safety of the deep circumflex iliac artery (DCIA) derived chimeric flap through the anatomical study of the blood vessels and perforating branches in the ilioinguinal region, and to provide the basis for selecting different DCIA chimeric flap schemes according to the difficulty of surgery, defect conditions and repair needs. METHODS: Six Chinese adult specimens were dissected by retrograde perfusion of red latex into bilateral femoral arteries...
December 2023: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://read.qxmd.com/read/38490814/effect-of-lower-body-negative-pressure-on-cardiac-and-cerebral-function-in-postural-orthostatic-tachycardia-syndrome-a-pilot-mri-assessment
#14
JOURNAL ARTICLE
Rachel J Skow, Stephen J Foulkes, Peter Seres, Meghan A Freer, Eric D Mathieu, Satish R Raj, Richard B Thompson, Mark H Haykowsky, Lawrence Richer
Postural orthostatic tachycardia syndrome (POTS) is characterized by an excessive heart rate (HR) response upon standing and symptoms indicative of inadequate cerebral perfusion. We tested the hypothesis that during lower body negative pressure (LBNP), individuals with POTS would have larger decreases in cardiac and cerebrovascular function measured using magnetic resonance (MR) imaging. Eleven patients with POTS and 10 healthy controls were studied at rest and during 20 min of -25 mmHg LBNP. Biventricular volumes, stroke volume (SV), cardiac output (Qc), and HR were determined by cardiac MR...
March 2024: Physiological Reports
https://read.qxmd.com/read/38488924/fetal-magnetic-resonance-imaging-ultrasound-and-echocardiography-findings-in-twin-reversed-arterial-perfusion-sequence
#15
JOURNAL ARTICLE
Julie E Walcutt, Beth M Kline-Fath, Bin Zhang, Foong-Yen Lim, Mounira A Habli, Allison A Divanovic, Usha D Nagaraj
BACKGROUND: Twin reversed arterial perfusion (TRAP) sequence is a rare complication of monochorionic multiple gestation pregnancies, in which the pump twin provides hemodynamic support to a nonviable co-twin (acardius). Fetal magnetic resonance imaging (MRI) is used to detect pump twin abnormalities, particularly brain ischemia, prior to fetal intervention to interrupt umbilical blood flow to the acardius. OBJECTIVE: To summarize the imaging findings of TRAP sequence pregnancies in a large series...
March 15, 2024: Pediatric Radiology
https://read.qxmd.com/read/38485680/hypoperfusion-of-amygdala-in-chronic-migraine-an-exploratory-quantitative-perfusion-imaging-using-3d-pseudo-continuous-arterial-spin-labeling
#16
JOURNAL ARTICLE
Yujiao Jiang, Xin Li, Shuqiang Zhao, Mengqi Liu, Zhiye Chen
BACKGROUND: Although the amygdala has structural and functional abnormalities in Chronic Migraine (CM), less is known about the altered perfusion of the amygdala in CM. OBJECTIVE: The current study aimed to assess amygdala perfusion in CM using a contrast agent-free and quantitative approach. METHODS: 15 Normal Controls (NC) and 13 patients with CM during the migraine interval were assessed for brain structure and subjected to 3D Pseudo- Continuous Arterial Spin Labeling (3D-PCASL) MR imaging...
March 12, 2024: Current medical imaging
https://read.qxmd.com/read/38478454/3d-single-vessel-fractional-moving-blood-volume-3d-svfmbv-fully-automated-tissue-perfusion-estimation-using-ultrasound
#17
JOURNAL ARTICLE
Yi Yin, Alys R Clark, Sally L Collins
Power Doppler ultrasound (PD-US) is the ideal modality to assess tissue perfusion as it is cheap, patient-friendly and does not require ionizing radiation. However, meaningful inter-patient comparison only occurs if differences in tissue-attenuation are corrected for. This can be done by standardizing the PD-US signal to a blood vessel assumed to have 100% vascularity. The original method to do this is called fractional moving blood volume (FMBV). We describe a novel, fully-automated method combining image processing, numerical modelling, and deep learning to estimate three-dimensional single vessel fractional moving blood volume (3D-svFMBV)...
March 13, 2024: IEEE Transactions on Medical Imaging
https://read.qxmd.com/read/38471987/monitoring-of-cerebral-blood-flow-autoregulation-physiologic-basis-measurement-and-clinical-implications
#18
REVIEW
Eric L Vu, Charles H Brown, Kenneth M Brady, Charles W Hogue
Cerebral blood flow (CBF) autoregulation is the physiologic process whereby blood supply to the brain is kept constant over a range of cerebral perfusion pressures ensuring a constant supply of metabolic substrate. Clinical methods for monitoring CBF autoregulation were first developed for neurocritically ill patients and have been extended to surgical patients. These methods are based on measuring the relationship between cerebral perfusion pressure and surrogates of CBF or cerebral blood volume (CBV) at low frequencies (<0...
March 11, 2024: British Journal of Anaesthesia
https://read.qxmd.com/read/38471504/an-accessible-deep-learning-tool-for-voxel-wise-classification-of-brain-malignancies-from-perfusion-mri
#19
JOURNAL ARTICLE
Alonso Garcia-Ruiz, Albert Pons-Escoda, Francesco Grussu, Pablo Naval-Baudin, Camilo Monreal-Aguero, Gretchen Hermann, Roshan Karunamuni, Marta Ligero, Antonio Lopez-Rueda, Laura Oleaga, M Álvaro Berbís, Alberto Cabrera-Zubizarreta, Teodoro Martin-Noguerol, Antonio Luna, Tyler M Seibert, Carlos Majos, Raquel Perez-Lopez
Noninvasive differential diagnosis of brain tumors is currently based on the assessment of magnetic resonance imaging (MRI) coupled with dynamic susceptibility contrast (DSC). However, a definitive diagnosis often requires neurosurgical interventions that compromise patients' quality of life. We apply deep learning on DSC images from histology-confirmed patients with glioblastoma, metastasis, or lymphoma. The convolutional neural network trained on ∼50,000 voxels from 40 patients provides intratumor probability maps that yield clinical-grade diagnosis...
March 5, 2024: Cell reports medicine
https://read.qxmd.com/read/38466054/the-role-of-preoperative-ct-perfusion-imaging-in-assessing-colorectal-cancer-angiogenesis-and-its-clinical-value
#20
JOURNAL ARTICLE
Wei Zhou, Xingwen Wang
PURPOSE: Angiogenesis, the formation of new blood vessels, plays a crucial role in tumor growth and metastasis. Understanding the vascular characteristics of colorectal cancer through preoperative computed tomography (CT) perfusion parameters can provide valuable insights into the tumor's aggressiveness and potential for spread. Additionally, exploring the correlation between these parameters and serum tumor marker levels may offer a comprehensive perspective on the disease's biological behavior...
March 8, 2024: Alternative Therapies in Health and Medicine
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