Teletheraphy

Question 1

6 STEPS TO TELETHERAPHY

Answer 1

1 DIAGNOSIS
2 * MULTIDISCIPLINARY
3 * SIMULATION
4 * TREATMENT PLANNING
5 * TREATMENT DELIVERY
6 * MONITORING and FOLLOW-U

Question 2

ROLE OF IMMOBILIZATION DEVICE

Answer 2

For accurate delivery of a prescribed radiation dose to a target volume while sparing surrounding normal and critical tissues.

Question 3

CHARACTERISTICS OF A GOOD
IMMOBILIZATION DEVICE

Answer 3

1. Ease of Use
2. Ease of making the device
3. Comfort for the patient
4. Minimal space requirement for storage
5. Resistance to bending and stretching
6. Minimal perturbation of the beam so as not to
   produce artifacts in image acquisition.
7. Its materials should minimally attenuate the
   radiation beam.

Question 4

The most common and is made from rigid
plastic that becomes pliable when placed in
warm water. When it is wet, it is placed over
the patient’s body and conforms to the
contour of treatment area

Answer 4

AQUAPLAST OR THERMOPLASTIC MASK

Question 5

Custom, bean bag type pillows that are placed around
the patient’s body.

Answer 5

VAC LOC

Question 6

The patient is positioned in prone as it allows the small
bowel to drop below the lateral field to avoid severe
side effects.

Answer 6

BELLY BOARDS

Question 7

3 types of treatment techniques

Answer 7

2D, 3D, IMRT (INTENSITY MODULATED
RADIATION THERAPY)

Question 8

Safety Features

Answer 8

1. Door Safety Interlocks
2. CCTV Camera
3. Intercom System
4. Warning Lights
5. Emergency-Off buttons (couch, gantry stand,
   modulator, and control console)
6. Additional Emergency-Off buttons

Question 9

What is LINAC?

Answer 9

High radio-frequency (RF) electromagnetic
waves to accelerate charge particles (i.e.
electrons) to high energies in a Linear Path inside
a tube-like structured called Accelerator
Waveguide.

The resonating cavity frequency of the Medical
LINACs is about 3 Billion Hertz (cycles/sec).

• This is the most common device to treat cancer
  with EBRT (External Beam Radiation Therapy).

Question 10

Is where the patient lays still to
receive the radiation treatment.

Answer 10

TREATMENT COUCH

Question 11

A large rectangular cabinet that is firmly
secured to the treatment room floor or wall.

Answer 11

DRIVE STAND

Question 12

It provides thermal stability
to the system.

Answer 12

WATER COOLING SYSTEM

Question 13

It helps direct the x-ray (photons) or electron
beams to the patient’s tumor.
* It rotates 360 degrees around a line of point
called the ISOCENTER.
* Its components:
a. Electron Gun
b. Accelerator Structure
c. Treatment Head

Answer 13

GANTRY

Question 14

• Electrons were produced by Thermionic
  Emission.

Answer 14

ELECTRON GUN

Question 15

It is a more common approach which spares much of the small intestine and
shields the spinal cord and the vast majority of the kidneys from half of the
beams

Answer 15

4-FIELD TECHNIQUE (BOX FIELD TECHNIQUE)

Question 16

To limit the dose to the Urinary Bladder and Rectum in order to permit maximization of the intracavitary dose to gross parametrial diseases and microscopic or gross pelvic disease (nodal or tumor extension). MIDLINE SHIELD/ MIDLINE BLOCK

Answer 16

MIDLINE SHIELD/ MIDLINE BLOCK