Indexed Positioning Lecture Flashcards
1
Q
Benefits of Indexed Positioning
A
- Close tolerance repositioning and localisation
- Streamline patient setup and target localisation
- Increase patent throughput
- Increase patient comfort
- Consistent and reproducible patient setup
2
Q
Criteria for Indexed Positioning
A
- Immobilisation
- Simple
- Efficient
- Comfortable
- Accurate
- Customisable
3
Q
Localisation Error
A
o Results from the failure to appreciate the full extent of the disease or to design adequate treatment field
4
Q
Immobilisation Error
A
o Occurs as a result of displacement of the treatment fields relative to the intended treatment volume
o Can be random or systematic
5
Q
Challenges for Head and Neck Immobilisation
A
- Claustrophobic Patients
- Mouthpieces/bite blocks while making a thermoplastic mask
- Reproducibility of the daily setup
- Setup Time
6
Q
Challenges for Breast and Thorax Immobilisation
A
- Flat vs Inclined Position
- Tangents only vs Three or more fields
- Limited range of motion of shoulder and arm
- Large breasted women
- Prone Positioning
- Irregular breathing
7
Q
Challenges of Hip And Pelvis Immobilisation
A
- Roll, Pitch and Yaw
- Cylindrical shape of this anatomical region
- Proximity to OAR: bowel, rectum, bladder, seminal vesicles
- Supine vs Prone
8
Q
Challenges of SBRT/SABR
A
- Comfort
- Setup Time
- Reproducibility/Repeatability
- Identifying Thoracic vs Abdominal Breath
- Irregular Breathing
- Tumour motion and ITV size
9
Q
Benefits of Patient Immobilisation
A
- Standardises patient positioning throughout the department
- Assures position reproducibility
- Reduces patient set up time
- Reduces tumour margins
- Improve target accuracy
