tomotherapy

Question 1

what is tomotherapy

Answer 1

‘slice therapy’

IMRT using a fan beam

Question 2

Image Modulated Radiotherapy IMRT

Answer 2

Treatment delivery technique that modulates the intensity of the beams, as well geometrically shaping them.

Question 3

Image Guided radiotherapy IGRT

Answer 3

Uses additional imaging equipment within the treatment room or mounted on the linac’s gantry, to acquire images prior or during treatment to evaluate and correct set-up errors before treatment delivery.

Question 4

advantages of CBCT

Answer 4

• Get a volume of CT data in one rotation
• Detector can be used for fluoroscopy
• Detector can be used for conventional portal images
• Composite images

Question 5

disadvantages of CBCT

Answer 5

• Add-on components lack integration
• Gantry sag corrections/ extra positional QA
• Unstable pixel values
• Limitation on field of view
• Metal artifacts (kV)
• Scatter artifacts
• Slow rotation speed
• Angular sampling artifacts

Question 6

physical advantages of tomo

Answer 6

• Looks like CT scanner (Patients relax with familiarity, the more relaxed they are the better the threatment as position is reproducible)
• Reduced manual handling issues
• No light field
• No FSD light scale
• No need for shielding accessories
• Load / unload couch feature