Quiz 2 - Energy, Techniques and Dose Fractionation Schedules

ONCOL 309 - Clinical Oncology I. University of Alberta.

WBRT - energy, technique, margin, dose fractionation

6 MV

Lateral POP

2 cm margin all around skull

30 Gy / 10 Fractions or 20 Gy / 5 fractions

Brain SRS - dose delivered to GTV

18Gy

Bone EBRT - Dose / Fractionation

3000 cGy / 10

2000 cGy / 5

800-1000 cGy / 1

Spinal Cord Compressions - Energy, Technique, margins, dose / fractionation

6 or 15 MV (based on depth)

Single Direct Field or POP

MRI = 1 vertebrae above and below. no MRI = 2 vertebrae

2000 cGy / 5 fractions is main

3000 cGy / 10 = few in-field recurrences

800-100 cGy / 1 fraction = pain relief

SVCO - dose fractionation for lymphoma

1200 cGy / 3 fractions

reassessment

3000 cGy / 15 fractions

SVCO - dose fractionation for standard treatment

2000 cGy / 5

3000 / 10 fractions

Esophageal obstruction - technique and dose fractionation

4 field box, 3D-CRT or VMAT

2000 cGy / 5 or 3000 cGy / 10

Nodal recurrence - energy, technique

6 or 15 MV depending on technique

POP or VMAT (VMAT uses 6 MV)

bolus used to acheive proper depth to nodes

Gynecological Treatment - RT treatment

RT with intravaginal packing

• vagina packed with monsels solution to clot tumor

then 3000 cGy / 10 fraction or 800 cGy/ 1 fraction

• 2.5 Gy-4 Gy hypofractionated to begin

Hemoptysis treatment - dose fractionation

high performance status: 2000/5 or 3000/10

poor performance: 800/1

EwS pre-chemo and no surgery - Energy, Technique, Dose / Fractionation, margins

6 MV

IMRT

50-60 Gy / 25-30 fractions

2 cm margins

EwS post op - Energy, Technique, Dose Fractionation, margins

6 MV

IMRT

Phase 1: 4500 cGy / 25 fractions

whole bone minus growth plate

Phase 2: 1000 cGy / 5 fractions

tumor bed and margin (exclude epiphyseal plate)

EwS Palliative Lung - Energy, Technique, Dose, Margins

6 MV

POP

12-20 Gy

Whole lung - include apex of lung and 1 cm of lateral space

brachial plexus and humoral head shielded