Table 1.
Patient characteristics and imaging protocol.
| Patient | Tumor site | No. of lesion ROIs | Att. corr. FDG-PET | MR-based µ-map | T2w MRI (TSE) | T1w MRI (VIBE) | Diffusion-weighted MRI |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| b = 150 (AP) | b = 150 (PA) | b = 800 (AP) | b = 800 (PA) | ADC (d.c.) | |||||||
| #01 | OP | 2 | ✓ | ✓ | (✓)b | ✓ | ✓ | ✓ | (✓)b | (✓)b | (✓)b |
| #02 | OP/HP/VAL | 3a | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #03 | HP | 2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #04 | OP | 2a | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #05 | OP | 1 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #06 | OP/MC | 2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #07 | BT/UV | 2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #08 | HP | 2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #09 | OP | 1 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| #10 | HP | 1 | ✓ | ✓ | ✓ | ✓ | (✓)c | (✓)c | (✓)c | (✓)c | (✓)c |
Abbreviations: OP – oropharynx; HP – hypopharynx; VAL – vallecula; MC – mouth cavity; BT – base of tongue; UV – uvula; ROI – region of interest; att. corr. – attenuation corrected; TSE – turbo spin echo; VIBE – volume interpolated breath hold; AP – anteroposterior; PA – posteroanterior; d.c. – distortion corrected.
a
One FDG avid ROI was no RT target; one MR ROI was only weakly PET positive and not considered in PET analysis.
b
Error in MR sequence parameter settings for scan with diagnostic setup.
c
Strong geometric distortions in DW-MRI with RT setup.