Table 2.
Significance of perfusion measurement standard deviation (SD) differences in kidney regions of interest (ROI) with different respiratory and background suppression strategies. The p-value of a two-tailed t-test between ROI-SD values for pairs of strategies is tabulated. Comparisons are shown by column with common strategies in the column headings; abbreviations are: Timed breathing ‘T’, Breath-Hold ‘BH’, Free breathing ‘F’, Heavy BGS ‘HBGS’, Moderate BGS ‘MBGS’, no BGS ‘no BGS’, and ‘versus’ denoted by ―; e.g. the first entries represent p-values for ROIs in the cortex and medulla when comparing Timed breathing with Heavy BGS to Timed breathing with no BGS.
| versus T-No BGS |
Heavy BGS |
Breath-Hold |
||||||
|---|---|---|---|---|---|---|---|---|
| Cortex |
Medulla |
Cortex |
Medulla |
Cortex |
Medulla |
|||
|
T-HBGS― |
0.01 |
0.007 |
BH― F |
0.54 |
0.53 |
HBGS― MBGS |
0.7 |
0.87 |
|
T-MBGS― |
0.0007 |
0.002 |
T― BH |
0.35 |
0.69 |
Timed Breathing |
||
|
BH-HBGS― |
0.0002 |
0.0002 |
T― F |
0.19 |
0.37 |
HBGS― MBGS |
0.61 |
0.87 |
|
BH-MBGS― |
0.0007 |
0.0001 |
Moderate BGS |
HBGS― no BGS |
0.01 |
0.007 |
||
|
F-HBGS― |
0.00007 |
0.00003 |
BH― F |
0.45 |
0.53 |
MBGS― no BGS |
0.0007 |
0.002 |
| F-MBGS― | 0.051 | 0.043 |
T― BH |
0.90 |
0.67 |
Free Breathing |
||
| T― F | 0.49 | 0.76 | HBGS― MBGS | 0.19 | 0.37 | |||