Chapter 6. Reference; Definition Of Parameter Terminology - OsteoSys SONOST 3000 User Manual

User's Manual (Confidential)
OsteoSys Co., Ltd.
Model Designation: SONOST 3000

Chapter 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
2) -1 ~ -2.5
3) -2.5 and below
 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
4) T < -3, T > +3 : 2.7 of 1,000 persons
5) T < -2, T > +2 : 4.6 of 100 persons
OT06-2R0423-06
: Normal
: Osteopenia
: Osteoporosis
９１
DOC. No. : OT06-2R0423-06-MUL
A4(210 × 297)