Radiotherapy Simulator (Radiation Therapy)

Question 1

Uses diagnostic x-ray tube as a radiation source and mimics the rafiotherapy machine.

Answer 1

Radiotherapy Simulator

Question 2

Is the process of developing, evaluating and accpeting a treatement startegy for a given patient situation.

Answer 2

Simulation

Question 3

The two purposes of a radiotherapy simulator

Answer 3

Tumor localization and Treatment Verification

Question 4

Determines the extent of tumor and location of ctitical structures

Answer 4

Tumor Localization

Question 5

Using of diagnostic quality images, it verifies the accuracy of the treatment plan befofe the actual treatment

Answer 5

Treatment Verificaction

Question 6

The 2 process of simulation

Answer 6

Conventional simulation and Computed tomography simulation

Question 7

Patient data is obtained using fluoroscopy, radiograph and physical measurements of patient

Answer 7

Conventional simulation

Question 8

Patient data gathered using detailed CT images on the transverse plane

Fused process of patient scanning, tumor and target localizaton, treatment planning and treatment field verification unto single operation

Answer 8

Computed tomography simulation

Question 9

It has the major advantagr of being able to construct a 3D image of the patient.

Answer 9

CT simulators

Question 10

Mechanical Components of a conventional radiotherapy simulator

Answer 10

• Isocenter
• Gantry head
• Image intensifier system
• Patient table top
• Control area

Question 11

Is referred to as the reference point in space where the gantry rotates (not done)

Answer 11

ISOCENTER

Question 12

What are the Gantry Head components?

Answer 12

• Collimator assembly
• Optical distance indicator
• X-ray tube
• Field defining wires
• Beam imitating diaphragm
• Accessory holder

Question 13

Directs the path of the beam toward the patient, after it emerges from the x-ray tube.

Answer 13

Collimator Assembly

Question 14

Projects scale onto patients skin which corresponds to the SSD

Answer 14

Optical Distance Collimator (ODI)

Question 15

X-ray tube

Answer 15

• Must have a large and small (no greater than 0.6mm) focal spot.

Question 16

Field Defining Wires

Answer 16

Simulate a maximun fieldsize of 40 x 40 cm at 100cm SSD

Wires represent edge of treatment field within larger
image.

Question 17

Beam restricting diaphragms

Answer 17

Optically indicates coverage of x-ray
field

Question 18

Fiducial Plate

Answer 18

Plexiglas or plastic trays imbedded with
lead markers

Question 19

Accessory Holder

Answer 19

Serves as holder for block tray holder
and electron cone holder

Question 20

Patient Table Top

Answer 20

• Hard flat surface that minimally attenuates
  the beam
• Constructed out of carbon fiber
• Provide support identical to that of treatment
  unit to maintain reproducibility

Question 21

Mechanical Components of the Control Area

Answer 21

X-ray Generator
TV Monitor
Remote Control Panel
Observation Window

Question 22

Room Design

Answer 22

X Recommended minimum size of 400sq.ft.
X Counter with sink, work space and writing area
X Storage for immobilization devices
X Ventilation
X Adjustable lighting for both treatment room and
control area
X Positioning lasers
X Provide therapist several external reference points in
relationship to the position of the isocenter