Computer Planning?

Question 1

what is the overall aim of treatment planning?

Answer 1

95% coverage
spare normal tissue as much as possible
keep critical structures within limits
ensure daily treatment replicable and accurate

Question 2

what is 2d planning?

Answer 2

planning on a single slice

Question 3

what is hand/manual planning involve?

Answer 3

overlays to create Isodose maps

Question 4

what is an appropriate slice thickness?

Answer 4

2-3mm

Question 5

What is a good limit both superiorly and inferiorly for CT data

Answer 5

5cm above and below

Question 6

important factors in CT scanning?

Answer 6

patient reproducible
errors will be carried forward
contrast can aid target delineation

Question 7

what are the common files used to transfer CT data

Answer 7

DICOM-digital imagine and communications in medicine

transfer RT structures, doses and treatment parameters

Question 8

file format of DICOM?

Answer 8

coordinates
patient must have correct orientation
supine or prone
XYZ coordinates

Question 9

what factors affect isocentre position?

Answer 9

PTV location

PTV size and shape

Question 10

what factors affect beam arrangements?

Answer 10

Ptv location, shape, size
structure in beam
OAR location beam energy and dose limits
external contour shape

Question 11

what are some specialised planning systems?

Answer 11

Multiplan

Tomotherapy

Question 12

important aspects of TPS

Answer 12

Acquisition of DICOMs 
3d dataset display 
Model different linacs
parameters
3d calculation of dose
evaluation tools
export DICOM

Question 13

inside the TPS box?

Answer 13

patient and beam model

dose calculation

Question 14

what is there treatment planning process?

Answer 14

register patient in TPS
import patient data
setup coordinates
identify volumes
add beams
prescribe radiation therapy
calculate dose distribution 
optimise plan
QA

Question 15

what 3d data can be imported?

Answer 15

Elekta, Philips, Siemens, Toshiba

MR/PET datasets

Question 16

why is it important to scroll through CT slices?

Answer 16

find fiducial markers/BBs

understand CT dataset orientation

Question 17

what is the common dose grid resolution for 3DCRT?

Answer 17

0.3-0.4

Question 18

IMRT/VMAT dose grid resolution?

Answer 18

0.2-0.25

Question 19

what is a treatment couch made of?

Answer 19

carbon firbre
foam core
metal components

Question 20

types of couches?

Answer 20

Varian
Elekta
other inserts

Question 21

what is an appropriate laser localisation?

Answer 21

where vertical and transverse lines traverse the 3 BBs for pelvis patient

Question 22

what external devices can effect dosimetry?

Answer 22

couch tops immobilisation equipment

can increase surface dose due to attenuation

Question 23

what are two approaches involving couch tops in TPS?

Answer 23

integrate a CT scan of treatment couch

Couch removal tool (pinnacle)

Question 24

how can CT couches be included?

Answer 24

Assign CT numbers

Question 25

how does the Monaco system include patient support devices?

Answer 25

couches are scanned and kept in a library