Patient populations:
Retrospective study 31 patients with cancer parotid
19 M, 12 F mean age is 61ys.
MR Examination:
MR unit (1.5 tesla) with EPI.
Routine MR (T1,T2WI).
Diffusion weighted MR imaging.
Post contrast fat suppressed T1WI.
MR imaging technique
Diffusion MR imaging:
Single shot spin echo EPI.
TR:10000 ms & TE: 108 ms.
B value: 0, 500,1000sec/mm2.
ADC map was reconstructed.
Scan time 1 min.
Post contrast T1WI:
Fat suppressed with inject of 0.1ml /Kg.
Image analysis
Quantitative assessment of ADC value:
ROI was drawn around parotid tumor.
Mean ADC value was calculated.
Final diagnosis
Pathological examination:
Tru cut biopsy or surgery were done for all patients.
Pathological type:
According to WHO classification.
Pathological grade:
well, moderately, poorly and undifferentiated.
Statistical analysis
Mean & SD:
ADC values of volume, path type & grade.
T test (P value):
Difference within each prognostic factor.
P value <0.05 was significant.
Pearsons Correlation:
ADC value correlated with prognostic parameters.