volumetric modulated arc-therapy

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3D - CRT Rectum Prostate Overdose 4 beams: 2 AP/PA +2 lateral beams Overdosage in bladder / rectum limits dose which can be delivered to tumor volume From 3D - CRT (appeared in 1995-not anymore “modern” ) 3D - CRT = 3D Conformal Radiation Therapy PROSTATE EXAMPLE Source: Amethyst management

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Volumetric modulated Arc-Therapy

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Page 1: Volumetric modulated Arc-Therapy

3D - CRT

Rectum

Prostate

Overdose

• 4 beams: 2 AP/PA +2 lateral beams

• Overdosage in bladder / rectum limits dose which can be delivered to tumor volume

From 3D - CRT (appeared in 1995-not anymore “modern” )

3D - CRT = 3D Conformal Radiation Therapy

PROSTATE EXAMPLE

Source: Amethyst management

Page 2: Volumetric modulated Arc-Therapy

From 3D - CRT to IMRT

“Control” of dose deposition still coarse

Target conformity

3D - CRT IMRT

3D - CRT = 3D Conformal Radiation TherapyIMRT = Intensity Modulated Radiation Therapy

• With IMRT up to 6-8 beam directions

• Still risk of overdosage in bladder/ rectum

PROSTATE EXAMPLE

Source: Amethyst management

Page 3: Volumetric modulated Arc-Therapy

IMRT technology (2000)

IMRT = Intensity Modulated Radiation Therapy

• IMRT Prostate showing five beams

• Dose distribution better than the 3D-CRT method but still high dose in bladder/ rectum

• Treatment time of about 10 minutes

Source: Amethyst management

“Control” of dose deposition still coarse

Target conformity

PROSTATE EXAMPLE

IMRT

Page 4: Volumetric modulated Arc-Therapy

VMAT = Volumetrically Modulated Arc Therapy

VMAT technology (used since 2009*)

• Beams, coming from 360 directions

• Highly conformal dose distribtution

• Only 2 minutes treatment time

Target conformity

Source: Amethyst management

PROSTATE EXAMPLE

VMAT

Page 5: Volumetric modulated Arc-Therapy

VMAT demo

From 3D - CRT to IMRT to VMAT

Source: Amethyst management