Part 4: 3D (conventional) localization films

Name all types of 3D (conventional) localization films

1. Orthogonal Films

2. Stereo Film Technique

3. Cross Table Lateral Film

4. Scout Film

term. Orthogonal Films

def. 2 images taken at right angles to each other to give a 3D view

What dimensions can you see in orthogonal films

x: width

y: length

z: depth

In orthogonal films, you take __ films which let you see in ___ dimensions

1 AP: x, y

1 Lateral: y, z

Stereo Film Technique aka

Stereo Shift Technique

term. Stereo Film Technique

def. Filming technique where patient remains stationary , while the tube rotates

Stereo Film Technique:

1. # of films

2. Taken at __ degree gantry intervals

1. 3 separate films (new film for each exposure)

2. 15

term. Cross Table Lateral Film

An attempt at 3D filming using:

• 1 lateral film, and

• an opaque marker placed on the anterior and posterior skin surfaces

What types of opaque markers are used for Cross Table Lateral Films?

• Wire

• coin

• etc.

Why do we place an opaque marker on the anterior and posterior skin surfaces? Give an example.

To measure relative distances to other structures in the body. For example. When treating a PA spine, we use this to verify the depth of the spinal cord

Purposes of Cross Table Lateral Film

1. Shows us the depth of critical structures relative to the skin surface

2. Shows us the magnification and divergence on the film compared to isocenter

term. Scout Film

def. A preliminary image (film) used for localization or verification e

Example of a scout film

Take a scout film before the 1st tx to verify you are in the right area

True or False: Scout Films are the same as weekly-port films

False

Field size is defined at

isocenter