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

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

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

Positioning – head in, supine

For positioning was used Blue Orfit set with the same

extensions for both groups

Referent points are on body and mask

Referent point on body only

All informations about

patients position and

extensions used are

noted in the Patient chart

for future reference

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

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)

Upon completion of RT treatment for each patient, we

calculated the mean shift for all three planes

› Sagittal plane

› Transverse plane

› Coronal plane

Obtained data was used in Excel spreadsheet

seperately for patients:

› with thermoplastic masks

› without thermoplastic masks

Results are compared on the graphs

Sagittal (lateral) plane

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

Transverse (longitudinal) plane

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

Frontal (coronal) plane

0

0,1

0,2

0,3

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

Sagittal (lateral) plane

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

Transverse (longitudinal) plane

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

Frontal (coronal)

plane

0

0,1

0,2

0,3

0,4

0,5

0,6

1 2 3 4 5 6 7 8

Before

treatment

After

treatment

with thermoplastic

fixation

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt 0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt

without thermoplastic fixation

with thermoplastic

fixation

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt

without thermoplastic fixation

0

0,1

0,2

0,3

0,4

0,5

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt

with thermoplastic

fixation

without thermoplastic

fixation

0

0,1

0,2

0,3

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt 0

0,1

0,2

0,3

0,4

0,5

0,6

1 2 3 4 5 6 7 8

Before

treatme

nt

After

treatme

nt

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

A sense of fear and discomfort for some

patients

Longer positioning of patients

Higher financial cost of treatment

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.

Thank you for your attention!!!