Rotational Treatment, Beam Obliquity

Rotational Field

A dynamic treatment field defining a somewhat cylindrical treatment volume, arcing around isocenter

Who is the rotational field best used for?

Best for small, symmetrically shaped, deep seated tumor

Extension of multiple field technique

What energy is best for rotational field

Higher energy photon beams

Normal tissue is treated for only a fraction of the treatment

360 degree rotational therapy:

the isocenter will be placed in the center of the tumor.

Any Skip Arc (butterfly arc):

the isocenter will be placed "past-pointing" to the tumor.

If the degree is not 360...

It is an arc technique treatment

Arc Treatment

Areas of tissue that are "skipped" to spare normal tissue

Past Point places the higher dose region in the tumor

Combination Treatment

You can combine arc treatments with the wedge and stationary fields

Beam Obliquidy

Increases side scatter

Decreased side scatter

Decreases in depth of perception

The lower the energy,

increases the side scatter

3d confromal

3rd one is most conformal and treats the most volume 

IMRT

We do not use parallel opposed beams 

3D conformal because what

there are parallel opposed beams 

ARC therapy

less than 360 degrees

arc ttherapy

If the gantry moves 360 degrees around the patient, the technique is called ___________

rotational therapy 

In theory which treatment technique irradiates the most volume at the highest dose?

3d conformal

this is a 

rotational treatment 

what treatment type is this 

IMRT

Which plan protects the OAR/small bowel the best

C