We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

Features Partner Sites Information LinkXpress
Sign In
Advertise with Us

Download Mobile App




Events

ATTENTION: Due to the COVID-19 PANDEMIC, many events are being rescheduled for a later date, converted into virtual venues, or altogether cancelled. Please check with the event organizer or website prior to planning for any forthcoming event.
30 Jan 2023 - 02 Feb 2023

3D Printed Plastics Could Replace Metallic Collimators

By MedImaging International staff writers
Posted on 18 Nov 2019
Print article
Image: Plastic collimator samples made using 3D printing (Photo courtesy of TPU)
Image: Plastic collimator samples made using 3D printing (Photo courtesy of TPU)
3D printing of plastic collimators for external beam radiation therapy (EBRT) could improve accuracy and reduce dose delivery and collimator manufacturing time, claims a new study.

In order to develop the plastic collimators, researchers at Tomsk Polytechnic University (TPU; Russia), Moscow City Oncology Hospital No. 62 (Russia), and University Hospital Hamburg-Eppendorf (UKE; Germany) first used a numerical model to study the capability of high impact polystyrene (HIS) and acrylonitrile butadiene styrene (ABS) plastics to absorb an electron beam, and the required thickness and manufacturing method needed for the printed collimator to completely absorb the EBRT dose.

They then used the plastics to manufacture the first products through the method of layer-by-layer fused deposition modeling, using rapid prototyping. As the manufacturing process can affect crucial properties, such as material homogeneity (due to the presence of residual air-filled cavities), Monte Carlo simulations were used to determine electron depth dose distribution. The appropriate thickness for total absorption of 6 MeV electron beams was found tobe at least 4 cm, at least 8 cm for 12 MeV, and 11 cm for 20 MeV. The study was published in the August 2019 issue of Physica Medica.

“Metal collimators should be 1.6 cm thick to absorb the beam but, unlike metal, plastic does not have the same density and a number of other characteristics. We conducted a number of calculations and experiments to determine the thickness of a plastic product,” said senior author Sergei Stuchebrov, PhD, of the TPU Research School of High-Energy Physics. “For instance, we used special dosimeters, placed inside the plastic, to measure the depth distribution of the electron beam. The results can be used to further develop 3D printing procedures for medical electron beam profile formation.”

Collimators allow radiotherapy treatment (RT) flexibility in shielding organs-at-risk (OAR), while ensuring that the prescribed dose is delivered to the target. While in linear RT, a multi-leaf collimator (MLC) can be used to align the treatment field parallel to the radiation field and to the shape of the tumor, EBRT works from multiple directions, requiring fabrication of a patient-specific collimator using hand-crafted blocks.

Related Links:
Tomsk Polytechnic University
Moscow City Oncology Hospital No. 62
University Hospital Hamburg-Eppendorf


New
Gold Supplier
Premium Ultrasound Scanner
ARIETTA 850
New
Hand-Held Bidirectional Vascular Doppler
Bidop 7
Endoscopic Ultrasound Processor
EU-ME3
New
Digital Radiographic System
Vieworks VIVIX-S

Print article
CIRS -  MIRION

Channels

Radiography

view channel
Researchers used AI to triage patients with chest pain (Photo courtesy of Pexels)

First Deep Learning AI Model Triages Patients with Chest Pain Using X-Rays

Acute chest pain syndrome can involve tightness, burning or other discomfort in the chest or a severe pain that spreads to the back, neck, shoulders, arms, or jaw, accompanied by shortness of breath.... Read more

Ultrasound

view channel
Image: Dr. Derek Cool demonstrating the new robotic 3D ultrasound system (Photo courtesy of Lawson Health)

Robotic 3D Ultrasound System Improves Accuracy of Liver Cancer Treatment

Liver cancer is the fourth-leading cause of cancer death in the world. Surgery is one treatment option for liver cancer, although thermal ablation which uses heat to destroy the cancerous tumor has less... Read more

General/Advanced Imaging

view channel
Image: The HIAS-29000 brain PET scanner with motion correction (Photo courtesy of Hamamatsu Photonics)

New Brain PET Scanner Corrects Blurring in Images Caused by Body Motion

Ordinary brain PET (positron emission tomography) scanners are unable to accurately measure the distribution of radiopharmaceuticals in the brain if the patients move their head during the examination process.... Read more

Imaging IT

view channel
Image: The new Medical Imaging Suite makes healthcare imaging data more accessible, interoperable and useful (Photo courtesy of Google Cloud)

New Google Cloud Medical Imaging Suite Makes Imaging Healthcare Data More Accessible

Medical imaging is a critical tool used to diagnose patients, and there are billions of medical images scanned globally each year. Imaging data accounts for about 90% of all healthcare data1 and, until... Read more
Copyright © 2000-2023 Globetech Media. All rights reserved.