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Dynamic contrast enhanced–MRI in head and neck cancer patients: Variability of the precontrast longitudinal relaxation time
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Image of FIG. 1.
FIG. 1.

map generated using the FA pair of 10° and 45° (labeled F1 on image) with muscle ROI superimposed.

Image of FIG. 2.
FIG. 2.

values for (a) muscle and (b) fat for the 14 patients analyzed. The mean value (full line) and one set of the literature value (dotted line) displayed for comparison (Ref. 40).

Image of FIG. 3.
FIG. 3.

Primary tumor ROI shown on map for patient P10 and node ROI shown for patient P15.

Image of FIG. 4.
FIG. 4.

Median values for (a) primary tumors and (b) nodes extracted from ROIs drawn by two independent physicians A and B. The mean values are calculated for each physician and graphed as lines.

Image of FIG. 5.
FIG. 5.

Variation percentages in and calculated using voxel-based maps versus using a constant value of for primary tumor and nodes.


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Average over three muscle and fat ROIs calculated with the variable TR technique and the VFA method using the 2° and 10° and 10° and 45° pairs for one patient. The value between the TR technique and each of the VFA technique resulting from a t-test comparison of means is shown.

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Published values in seconds for muscle and fat at 1.5 T. Mean of the published , the mean values from 14 patients obtained in this , and the value as a result of a t-test comparison between the two means are also reported.

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Comparison of median values for three representative patients, for primary and node ROIs between SDs. values are calculated from the Baseline (considered as control), LeadIn, CRT, and End time points. Values are reported as . value is calculated by the Friedman test for nonparametric repeated measurements.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic contrast enhanced–MRI in head and neck cancer patients: Variability of the precontrast longitudinal relaxation time (T10)