Imaging Modalities Flashcards
1
Q
What is the role of CT in RT?
A
- gain insight of position and size of tumour and surrounding tissue
2
Q
What are the advantages of CT in RT?
A
- allows user to plan and calculate dose
- accurate dose distribution in planning od PTV and OAR
3
Q
What are the disadvantages of CT in RT?
A
- suboptimal tissue contrast
- doesn’t provide functional information
- bore size limitation for larger patient and immbolisation equipment
4
Q
What is the role of ultrasound in RT?
A
- form of IGRT which provides realtime trackinf (e.g. bladder filling)
5
Q
What are the advantages of ultrasound in RT?
A
- non-ionising
- real time
- markerless
- excellent soft tissue contrast
6
Q
What are the disadvantages of ultrasound in RT?
A
- image quality is user dependent
- exensive equipment and RT training required
- could decrease departmental efficiency
7
Q
What is the role of PET in RT?
A
- image fusion to identify extensive disease
- SPECT-CT imaes used in RT planning to precisly delineate the tumour volume
8
Q
What are the advantages of PET in RT?
A
- high accurate image fusion
- good indication of metastasis
- indication of LNs involvement
9
Q
What are the disadvantages of PET in RT?
A
- long waiting time
- not widely available in RT department
- expensive
- patient required to fast
10
Q
What is the role of MRI in RT?
A
- high quality soft tissue contrast
- increased accuracey of target delineation and contouring
11
Q
What are the advantages of MRI in RT?
A
- non-ionising
- captures organ motion
12
Q
What are the disadvantages of MRI in RT?
A
- not suitable for all patients (e.g. pacemaker)
- not compatable with TOS
- high cost and time
- magnetic field safety
