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Linear correlation between ultrasound ATT and bone volume fraction (BV/TV) using (a) traditional QUS (ATTM-L) in medial-lateral orientation and (b) combined transmission-reflection QUS (ATTT-R) in the frontal plane. Correlation of ATTT-R vs BV/TV (R2 = 0.69) is significantly higher than ATTM-L vs BV/TV (R2 = 0.56), p < 0.01.
