Choline/NAA Spatial Variation
Lars Ewell
Radiation Oncology University of Arizona Medical Center
1/25/08
1
Cho/NAA Spatial VariationMetabolite Ratios for Different Tissue
0
0.51
1.5
2
2.53
3.5
44.5
5
1 2 3
Ratio
Cho/Cr
Cho/NAA
NAA/Cr
RadiationInduced Necrosis
WhiteMatter
RecurrentTumor
Cho/NAA has potential for necrosis/disease discrimination
Weybright et al., Neuroradiology (2004) 46: 541–549
Patient 1, Cho/NAA 3/23/07
• Highest ratio near center of disease/radiation.
• Dark blue not zero, ambiguous, indeterminate spectra.
Patient 1, Cho/NAA 5/8/07
• Highest ratio moved posterior relative to 3/23/07 spectra.
• Dark blue not zero, ambiguous, indeterminate spectra.
Cho/NAA Ratio: Spatial Variation - Row 11
0.00
0.20
0.40
0.60
0.80
1.00
0.00 1.00 2.00 3.00
Dist. from Inferior Slice (cm )
Cho
/NA
ACho/NAA Column 5
Cho/NAA Column 11
Cho/NAA Column 6
Cho/NAA Column 7
Cho/NAA Column 8
Cho/NAA Column 9
Cho/NAA Column 10
• Central Increase going from Inferior to Superior Slice: Columns 6, 7, 8
•Peripheral Decrease going from Inferior to Superior Slice: Columns 5, 10, 11
• Similar behavior for row number 12
Cho/NAA Ratio: Spatial Variation - Row 12
0.00
0.20
0.40
0.60
0.80
1.00
0.00 1.00 2.00 3.00
Dist. from Inferior Slice (cm )
Cho/
NAA
Cho/NAA Column 5
Cho/NAA Column 11
Cho/NAA Column 7
Cho/NAA Column 8
Cho/NAA Column 9
Cho/NAA Column 10
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