No.

VTI Test

Parameters Abbreviation

Units

Parameter Description

Parameter Interpretation

Parameter Class

Targeting/Contributing Pelvic Structures

1

1

Fmax

N

Maximum value of force measured during the VTI probe insertion [9]

Maximum resistance of anterior vs posterior widening; tissue elasticity at specified location (capability to resist to applied deformation)

Maximum vaginal tissue elasticity at specified location

Tissues behind the anterior and posterior vaginal walls at 3 - 15 mm depth

2

1

Work

mJ

Work completed during the probe insertion (Work = Force × Displacement) [9]

Integral resistance of vaginal tissue (anterior and posterior) along the probe insertion

Average vaginal tissue elasticity

Tissues behind the anterior and posterior vaginal walls at 3 - 15 mm depth

3

1

Gmax_a

kPa/mm

Maximum value of anterior gradient (change of pressure per anterior wall displacement in orthogonal direction to the vaginal channel)

Maximum value of tissue elasticity in anterior compartment behind the vaginal at specified location

Maximum value of anterior tissue elasticity

Tissues/structures in anterior compartment at 10 - 15 mm depth

4

1

Gmax_p

kPa/mm

Maximum value of posterior gradient (change of pressure per posterior wall displacement in orthogonal direction to the vaginal channel)

Maximum value of tissue elasticity in posterior compartment behind the vaginal at specified location

Maximum value of posterior tissue elasticity

Tissues/structures in anterior compartment at 10 - 15 mm depth

5

1

Pmax_a

kPa

Maximum value of pressure per anterior wall along the vagina

Maximum resistance of anterior tissue to vaginal wall deformation

Anterior tissue elasticity

Tissues/structures in anterior compartment

6

1

Pmax_p

kPa

Maximum value of pressure per posterior wall along the vagina

Maximum resistance of posterior tissue to vaginal wall deformation

Posterior tissue elasticity

Tissues/structures in posterior compartment

7

2

P1max_a

kPa

Maximum pressure at the area of pubic bone (anterior, A1 in Figure 2)

Proximity of pubic bone to vaginal wall and perineal body strength

Anatomic aspects and tissue elasticity

Tissues between vagina and pubic bone; perineal body

8

2

P2max_a

kPa

Maximum pressure at the area of urethra (anterior, A2 in Figure 2)

Elasticity/mobility of urethra

Anatomic aspects and tissue elasticity

Urethra and surrounding tissues

9

2

P3max_a

kPa

Maximum pressure at the cervix area (anterior, A3 in Figure 2)

Mobility of uterus and conditions of uterosacral and cardinal ligaments

Pelvic floor support

Uterosacral and cardinal ligaments

10

2

P1max_p

kPa

Maximum pressure at the perineal body (posterioir, see P1 in Figure 2)

Pressure feedback of Level III support

Pelvic floor support

Puboperineal, puborectal muscles

11

2

P2max_p

kPa

Maximum pressure at middle third of vagina (posterioir, see P2 in Figure 2)

Pressure feedback of Level II support

Pelvic floor support

Pubovaginal, puboanal muscles

12

2

P3max_p

kPa

Maximum pressure at upper third of vagina (posterioir, see P3 in Figure 2)

Pressure feedback of Level I support

Pelvic floor support

Iliococcygeal muscle, levator plate

13

2

G1max_a

kPa/mm

Maximum gradient at the area of pubic bone (anterior, see A1 in Figure 2)

Vaginal elasticity at pubic bone area

Anterior tissue elasticity

Tissues between vagina and pubic bone; perineal body