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27 paź 2021 · Arterial input function (AIF) is commonly defined as the concentration of the contrast medium in an artery measured over time by placing a region of interest. Use in MRI and CT. It is important to be precise that on MRI the estimation of the concentration is obtained indirectly from the induced changes in the relaxation times 1.
In this study, we designed an automatic AIF sampling method that identifies arterial voxels using a multi-step screening approach based on both the temporal and spatial information of the dynamic images.
Arterial input function (AIF), also known as a plasma input function, refers to the concentration of tracer in blood-plasma in an artery measured over time.
1 paź 2013 · The arterial input function (AIF) is central to perfusion quantification. • The AIF describes the contrast agent input to the tissue of interest. • This review article covers the key issues related to the AIF in perfusion MRI. • The issues of how and where to measure the AIF are discussed in detail. •
Note—The following four arterial input function (AIF) locations were used: AIF 1, proximal to the clot on the ipsilateral ischemic side; AIF 2, distal to the clot on the ipsilateral side; AIF 3, symmetric to AIF 1 on the unaffected contralateral side; and AIF 4, symmetric to AIF 2 on the contralateral side.
Central to quantification of CBF using this technique is the so-called arterial input function (AIF), which describes the contrast agent input to the tissue of interest.
Measurements of arterial input function (AIF) can have large systematic errors at standard contrast agent doses in dynamic contrast enhanced MRI (DCE-MRI). We compared measured AIFs from low dose (AIF LD) and standard dose (AIF SD) contrast agent injections, as well as the AIF derived from a muscle reference tissue and artery (AIF ref ).
