====== Compute Volume Of Chest Wall ======

This command is based on the article by Ferrigno et al (1994) J Appl Physiol 77(3) 1224-1231.

==== Marker Placement ====

The command expects all 32 vertices described in the article.

If any markers/landmarks are missing in a frame, no volume is computed.

{{:ChestWall1.jpg}}

\\


==== Pipeline Command ====

**Compute_Volume_Of_Chest_Wall**
/SIGNAL_TYPES=TARGET
/SIGNAL_NAMES=1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32
/SIGNAL_FOLDER=ORIGINAL
/RESULT_NAME=VOLUME
! /RESULT_FOLDER=PROCESSED
**;**
==== Units ====

Visual3D uses MKS units throughout the analyses. The only exceptions are joint angles which are represented in degrees.

The units for the volume are therefore m^3

Note that 1 m^3= 1000 liters

==== Compute_Volume_Of_A_Convex_Hull ====

{{:ChestWall2.jpg}}

In Figure 2 the volume of the highlighted volume can be computed as a convex hull.

The volume of the chest wall is the sum of the volumes of the sub regions.

=== Output signal ===

The resulting signal contains two components. The first component is the volume The second component is the number of vertices that were available at that frame for computing the volume.