arterial input function
Improving Perfusion Measurement in DSC–MR Imaging with Multiecho Information for Arterial Input Function Determination
... Because multiecho information is used to better select AIF voxels through avoiding truncation artifacts, the overall location of AIF voxels changes. This change may have implications for inclusion of partial-volume ...
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Perfusion Weighted MR Imaging Studies in Brain Hypervascular Diseases: Comparison of Arterial Input Function Extractions for Perfusion Measurement
... all arterial voxels detected in the brain, the AIF estimate was less affected by aliasing from the high-flow arteries and brain arteriovenous shunts, but anatomic correspondence be- Table 5: Abnormal ...
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Quantitative three dimensional myocardial perfusion cardiovascular magnetic resonance with accurate two dimensional arterial input function assessment
... Image reconstruction was performed using ReconFrame (Gyrotools LLC, Zurich, Switzerland). Subsequent post- processing was implemented in Matlab (The Math- Works, Natick, MA, USA). Image reconstruction was performed using ...
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Influence of Partial Volume on Venous Output and Arterial Input Function
... BACKGROUND: CT perfusion (CTP) is an important diagnostic tool for the imaging of cerebral hemo- dynamics. To obtain quantitative values of cerebral blood volume (CBV), blood flow (CBF), and mean transit time (MTT), ...
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A functional form for a representative individual arterial input function measured from a population using high temporal resolution DCE MRI
... In order to decouple the response of the tissue from the contrast agent administration protocol, tracer kinetic modelling requires the concentration of the contrast agent in the feeding arteries, also known as the ...
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Test-retest reliability and convergent validity of (R)-[11C]PK11195 outcome measures without arterial input function
... Purpose: The PET radioligand (R)-[ 11 C]PK11195 is used to quantify the 18-kDa translocator protein (TSPO), a marker for glial activation. Since there is no brain region devoid of TSPO, an arterial input ...
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Does the Location of the Arterial Input Function Affect Quantitative CTP in Patients with Vasospasm?
... MATERIALS AND METHODS: A retrospective study was conducted of patients with aneurysmal SAH admitted from 2005 to 2011. Inclusion criteria were the presence of at least 1 anterior cerebral artery or MCA vessel with a ...
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Development and performance test of an online blood sampling system for determination of the arterial input function in rats
... response function determination of an accurate arterial input function is ...studies, arterial sampling is limited by small blood volume of rodents, and the irreversible blood loss ...
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Evaluation of an automated method for arterial input function detection for first pass myocardial perfusion cardiovascular magnetic resonance
... First-pass contrast-enhanced perfusion cardiovascular magnetic resonance (CMR) is a useful diagnostic tool for the detection of coronary artery disease [1–3]. Quantita- tive assessment of myocardial blood flow (MBF) pro- ...
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Use of a beta microprobe system to measure arterial input function in PET via an arteriovenous shunt in rats
... A further drawback of PET-derived IF in microPET studies of the brain is the need to position both the heart and region of interest (e.g., cerebral cortex) in the field-of-view. Particularly where regions of interest are ...
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Automated Method for Generating the Arterial Input Function on Perfusion Weighted MR Imaging: Validation in Patients with Stroke
... residue function reaches its maximum value relative to zero at each pixel, whereas CBF maps show the flow at each pixel obtained from the residue function as its value at time t ⫽ 0 (initial point of the ...
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Prospective study on the mismatch concept in acute stroke patients within the first 24 h after symptom onset - 1000Plus study
... For post-processing of PI, mean transit time (MTT) para- metric images are determined by deconvolution of the arterial input function (AIF) for which multiple voxels are automatically identified. MTT ...
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Multiparametric MRI: practical approach and pictorial review of a useful tool in the evaluation of brain tumours and tumour-like lesions
... AIF: Arterial input function; Cho: Choline; Cr: Creatine; DSC: Dynamic susceptibility contrast; DWI: Diffusion-weighted imaging; FLAIR: Fluid-attenuation inversion recovery; GE-EPI: Gradient-echo ...
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Fully automated, inline quantification of myocardial blood flow with cardiovascular magnetic resonance: repeatability of measurements in healthy subjects
... the arterial input function (AIF) used a low flip angle FLASH low resolution protocol with 2 echos such that the echo times were short to minimize T2* losses at high concentration, and so that ...
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Measurement of myocardial blood flow by cardiovascular magnetic resonance perfusion: comparison of distributed parameter and Fermi models with single and dual bolus
... Fermi function with the first-pass of the arterial in- put function, setting the end-point at the CA concentra- tion minimum before the recirculation component begins (this range varies from patient ...
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Voxel wise quantification of myocardial blood flow with cardiovascular magnetic resonance: effect of variations in methodology and validation with positron emission tomography
... short-axis arterial input function (AIF) extraction; ...Fermi function parameterization, truncated singular value decomposition (TSVD) and first-order Tikhonov regularization with ...
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Simultaneous 13N-Ammonia and gadolinium first-pass myocardial perfusion with quantitative hybrid PET-MR imaging: a phantom and clinical feasibility study
... Gadobutrol (Gadovist, Bayer, Germany) contrast was administered as a dual bolus with dose 0.0075 mmol/kg (dilute) + 0.075 mmol/kg (neat) as previously de- scribed (Ishida et al. 2011; Hussain et al. 2012). The predilute ...
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Fully automated, inline quantification of myocardial blood flow with cardiovascular magnetic resonance: repeatability of measurements in healthy subjects
... the arterial input function (AIF) used a low flip angle FLASH low resolution protocol with 2 echos such that the echo times were short to minimize T2* losses at high concentration, and so that ...
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Fetal Origin of the Posterior Cerebral Artery Produces Left Right Asymmetry on Perfusion Imaging
... to arterial transit delays unless (and perhaps even if) such tech- nically demanding and time-consuming procedures as arterial input function estimation and deconvolution are ...
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Dynamic Contrast Enhanced MR Imaging in Head and Neck Cancer: Techniques and Clinical Applications
... Arterial Input Function. Another crucial component of DCE–MR imaging is the assessment of an AIF. The AIF estimates the rate of change in the concentration of contrast in the plasma (vascular space) ...
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