GE Logiq 3 Instruction Manual

Measurement Formulas
LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual 2-15
Direction 5122542-100 Rev. 2 .
Table 2-3: Volume Calculation Formulas
Calc NameInput MeasurementsFormula
Volume (spherical)
one distance
Vo l [ m l ] = (π/6)xd^3
Volume (prolate spheroidal) two distances, d1>d2 Vol[ml]= (
π/6)xd1xd2^2
Volume (prolate spheroidal) one ellipse, d1 major axis, d2  minor axis Vol[ml]= (
π/6)xd1xd2^2
Volume (spheroidal) three distances
Vol[ml]= (
π/6)xd1xd2xd3
Volume (spheroidal) one...

Measurement Formulas
2-16LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual
Direction 5122542-100 Rev. 2
Formulas–OB
Table 2-5: OB Calculation Formulas
Calc 
Mnemonic
Calc Name
Input 
Measurements
Formula
Author 
Reference
AC Abdominal 
Circumference circumference by 
trace, ellipse, circle 
or two distances AC=13.3+1.61 (GA) -
0.00998 (GA)2Hadlock et al, 
Radiology, 
152:497-501, 
1984
BPD Biparietal 
Diameter one distance BPD = -3.08+0.41 (GA) - 
0.000061 (GA)
3
CRLCrown Rump 
Length one...

Measurement Formulas
LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual 2-17
Direction 5122542-100 Rev. 2 Table 2-6: CUA Hadlock Formulas
Calc 
MnemonicCalc 
Name
Formula
Author 
Reference
CUAaComposite 
Ultrasound 
Age 1. CUA (BPD) = 9.54 + 1.482 * BPD + 0.1676 * BPD2
2. CUA (HC) = 8.96 + 0.540 * HC + 0.0003 * HC3
3. CUA (AC) = 8.14 + 0.753 * AC + 0.0036 * AC2
4. CUA (FL) = 10.35 + 2.460 * FL + 0.170 * FL2
5. CUA (BPD, HC) = 10.32 + 0.009 * HC2 + 1.3200 * 
BPD + 0.00012 * HC3
6. CUA (BPD, AC)...

Measurement Formulas
2-18LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual
Direction 5122542-100 Rev. 2
EFWEstimated Fetal 
Weight AC, HC, and FL EFW [g]=10^(1.326-
(0.00326 * AC [cm] * FL 
[cm]) + (0.0107 * HC [cm]) + 
(0.0438 * AC [cm]) + (0.158 
* FL [cm])) Hadlock, 
AJOG, 
151:333, 1985
EFW Estimated Fetal 
Weight AC, HC, BPD, FL EFW [g] = 10^(1.3596- 
(0.00386 * AC [cm] * FL 
[cm]) + (0.0064 * HC [cm]) + 
(0.00061 * BPD [cm] * AC 
[cm]) + (0.0424 * AC [cm]) + 
(0.174 * FL [cm])) Hadlock,...

Measurement Formulas
LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual 2-19
Direction 5122542-100 Rev. 2 Amniotic Fluid
Index (AFI) The normal values are considered to be:
36-40 weeks
0-5 cm = very low
5.1-8.0 cm = low
8.1 - 18.0 cm = normal
>18.0 = high
Dr. Rutherford/Dr. Phelan, 
Obstetrics and Gynecology , Volume 
70, No. 3, Part 1, p.353-6, Sept. 1987.
28-40 weeks
15.0 cm = average
>20.0 - 24.0 = hydramnios

Measurement Formulas
2-20LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual
Direction 5122542-100 Rev. 2
Formulas–GYN 
Table 2-8: GYN Calculation Formulas
Calc 
Mnemonic
Calc Name
Input 
Measurements
Formula
Ut-L Uterine Length one distanceUt-L[cm or mm]=d1
Ut-H Uterine Height one distanceUt-H[cm or mm]=d1
Ut-W Uterine Width one distanceUt-W[cm or mm]=d1
Ut-Volume Uterine Volume Ut-L, Ut-H, Ut-W Ut-Volume=0.5236 x 
Ut-L[cm or mm] x 
Ut-H[cm or mm] x 
Ut-W[cm or mm]
UtPFD Uterus Portio-Fundus...

Measurement Formulas
LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual 2-21
Direction 5122542-100 Rev. 2
LtOvFo[ml] Left Ovary Follicles One distancebD1[cm]3 x π/6
Two distances
bD1[cm]2 x D2x[cm] π/6 
                     : (D1 

Measurement Formulas
2-22LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual
Direction 5122542-100 Rev. 2
Formulas–Vascular
Table 2-9: Vascular Calculation Formulas
Calc 
Mnemonic
Calc NameInput MeasurementsFormula
RT ECA Right External Carotid Artery 
Ve l o c i t y one Doppler blood flow 
peak velocityRT ECA=v1
[cm/s or m/s]
RT CCA Right Common Carotid Artery  Ve l o c i t y one Doppler blood flow 
peak velocityRT CCA=v1
[cm/s or m/s]
RT BIFURC Right Carotid Bifurcation  Ve l o c i t y one...

Measurement Formulas
LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual 2-23
Direction 5122542-100 Rev. 2
Formulas-Cardiac
The Following table lists the card iac calculations. the folders 
where to find tha calculations and related measurements are 
indicated in brackets “[ ]”.
Table 2-10: Cardiac Calculation Formulas
%FS [Dimension, Cube/Teicholz]
Mode : 2D, CF, VR2D
Formula : (({LFIDd}-[LVIDs])/{LVIDd])
Needs measurement : LVIDd [Dimension, Cube/Teichloz], LVIDs 
[Dimension, Cube/Teichloz]...

Measurement Formulas
2-24LOGIQ 3 Expert/LOGIQ 3 Pro/LOGIQ 3 Advanced Reference Manual
Direction 5122542-100 Rev. 2
Ao/LA [Generic, Dimension]
Mode: MM:CM:AMM:CAMM:VRMM
Formula: {Ao Diam}/{LA Diam}
Needs measurement: Ao Diam [Generic , Dimension], LA Diam [Generic, 
Dimension]
Measured by: LA/Ao [MMLAAO]
AP Area [Aortic]
Mode: CW:PW:VRCW:VRPW
Formula: {LVOT Diam}^2*0.785*({LVOT VTI}/{AP VTI})
Needs measurement: LVOT Diam [Aortic], LVOT VTI [Aortic], AP VTI 
[Aortic]
Measured by: AP Area [SDMANTRACE]
AR...