Thermoplastic fixation of patients undergoing radiotherapy of thoracic region
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Transcript of Thermoplastic fixation of patients undergoing radiotherapy of thoracic region
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Thermoplastic fixation of patients undergoing radiotherapy of thoracic region
Đurđica Harmicar, Kemal Choudhury, Helena Režić
KBC Zagreb
Zagreb,7.studeni 2015
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Introduction Research was conducted on patients with lung
cancer Lung cancer is the most common in the world More than 3000 people are diagnosed with
lung cancer in Croatia every year Most common types are:
› SCLC› NSCLC
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Goals of study Advantages and disadvantages of thermoplastic masks
in radiation therapy of thoracic region
Eficiency of thermoplasctic masks in positioning and fixation of patients during RT treatment of lung carcinoma
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The study was conducted on 16 patients
8 patient with masks 8 patient withouth masks
CT simulation was done on Toshiba Aquillion LB CT scanner
RT therapy was done on Elekta Synergy linear accelerator
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Positioning and fixation of patients Positioning – head in, supine For positioning was used Blue Orfit set with the same
extensions for both groups
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Patient with thermoplastic mask
Referent points are on body and mask
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Patients without thermoplastic mask
Referent point on body only
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All informations about patients position and extensions used are noted in the Patient chart for future reference
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Patient registration
Registration of patents was done:› Before RT tretment› After RT treatment
First 3 fractions and every fifth time during the treatment
All offsets were recorded in chart for the patients
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Patient registration tools For patient registration XVI (X-ray Volume Imaging) was
used Protocol on XVI: Chest Volume View with Bowtie filter
F1 – Chest M20 360 degree gantry rotation ~ 5 f/s 2 min / (3.18°/s)
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Registration results
Upon completion of RT treatment for each patient, we calculated the mean shift for all three planes
› Sagittal plane› Transverse plane› Coronal plane
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Registration results
Obtained data was used in Excel spreadsheet seperately for patients:
› with thermoplastic masks › without thermoplastic masks
Results are compared on the graphs
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Registration with thermoplastic fixation
Sagittal (lateral) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
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Registration with thermoplastic fixation
Transverse (longitudinal) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
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Registration with thermoplastic fixation
Frontal (coronal) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
Before treatment
After treatment
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Registration without thermoplastic fixation
Sagittal (lateral) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
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Registration without thermoplastic fixation
Transverse (longitudinal) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
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Registration without thermoplastic fixation
Frontal (coronal) plane
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
0.6
Before treatment
After treatment
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Crossreference of sagittal (lateral) line
with thermoplastic fixation
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
without thermoplastic fixation
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Crossreference of transverse (longitudianl) line
with thermoplastic fixation
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatment
After treatment
without thermoplastic fixation
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
Before treatmentAfter treatment
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Crossreference of frontal (coronal) line
with thermoplastic fixation
without thermoplastic fixation
1 2 3 4 5 6 7 80
0.1
0.2
0.3
Before treatment
After treatment
1 2 3 4 5 6 7 80
0.1
0.2
0.3
0.4
0.5
0.6
Before treatment
After treatment
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Advantages of fixation with masks
Minimizes the physical movements of the patient (e.g. Cough)
Possible reconstruction of reference marks Double check the patients position Monitoring of patients weight Possible reconstruction of izocentric marks
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Disadvantages of patients with masks
A sense of fear and discomfort for some patients
Longer positioning of patients Higher financial cost of treatment
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Conclusion
The use of thermoplastic masks showed that we were a little more precise in positioning of the patients, also it has showen its benefits in other aspects of radiation therapy course.
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Thank you for your attention!!!