Calculates a T1 map using two inversion recovery images and a reference spin or gradient echo image using Schuffs method . For the method to work the repetition time must be long, i.e. \(TR >> T1\) and one inversion time must be short and one long. The short and long inversion times \(TI_1\) and \(TI_2\) must fulfill
for all expected T1 values in the imaged region. Further, the echo time must be identical as well as the excitation RF-pulse. When these conditions are met T1 can be estimated using the equation :
where \(SE\) is the signal intensity in the reference image and \(SI_1\) and \(SI_2\) are the signal intensities in the inversion recovery images with short and long inversion time, respectively.
Reference image with long repetition time.
Type: Image4DFloat, Required, Single
Two inversion recovery images with short and long inversion time (and long repetition time). See above for a more precise definition of short and long inversion times.
MetaData: Requires the field InversionTime to be present in the metadata.
Type: Image4DFloat, Required, Multiple
A T1 map. The T1 map has the same unit as the inversion time in the metadata, typically given in ms.
- Jahng, L. Stables, A. Ebel, G. B. Matson, D. J. Meyerhoff, M. W. Weiner, and N. Schuff, “Sensitive and fast T1 mapping based on two inversion recovery images and a reference image,” Med. Phys., vol. 32, no. 6, pp. 1524–1528, May 2005.
Keywords: T1 estimation, Schuff's method, T1 map
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