User’s Manual (Confidential)
OsteoSys Co., Ltd.
Model Designation : SONOST 3000 DOC. No. : OT06-2R7124
93
6 Reference
6.1 Definition of parameter terminology
BUA(Broadband Ultrasound Attenuation)
Parameter which reflect bone density and structure by reduction analysis of
ultrasound pulse intensity which through the bone.
SOS(Speed Of Sound)
Velocity of ultrasound wave through the bone which reflect bone mineral density
BQI(Bone Quality Index)
Generally SOS is in proportion to the temperature, and BUA is in inverse
proportion to the temperature. These correlation coefficients are (α, β) combined
for as shown below. This Parameter which is represented constant number
compensates the precision error from the temperature.
The relation between age and BQI (Refer to the picture)
BQI = α x SOS + β x BUA
T-Score
Average BQI in twenties(Young adult), that is BQI standard deviation in
twenties.
① More than -1 : Normal
② -1 ~ -2.5 : Osteopenia
③ -2.5 and below : Osteoporosis
T- Score’s meaning in the view of probability
T-Score represents the patient’s BQI above or below a reference “Young adult”
mean and is expressed in standard deviation(SD) units.
Therefore, If patient’s BMD value makes normal distribution shape, then T-
Score means in the view of probability as below.
① T < -6, T > +6 : 2 of 1,000,000,000 persons
② T < -5, T > +5 : 3.8 of 100,000,000 persons
③ T < -4, T > +4 : 6.3 of 10,000 persons
To Next Page
Loading...
