Impact of 1.5â
T Magnetic Field on Treatment Plan Quality in MR-Guided Radiotherapy: Typical Phantom Test Cases.
Technol Cancer Res Treat
; 23: 15330338241272038, 2024.
Article
de En
| MEDLINE
| ID: mdl-39106410
ABSTRACT
PURPOSE:
This study aims to investigate the influence of the magnetic field on treatment plan quality using typical phantom test cases, which encompass a circle target test case, AAPM TG119 test cases (prostate, head-and-neck, C-shape, multi-target test cases), and a lung test case. MATERIALS ANDMETHODS:
For the typical phantom test cases, two plans were formulated. The first plan underwent optimization in the presence of a 1.5 Tesla magnetic field (1.5â T plan). The second plan was re-optimized without a magnetic field (0 T plan), utilizing the same optimization conditions as the first plan. The two plans were compared based on various parameters, including con-formity index (CI), homogeneity index (HI), fit index (FI) and dose coverage of the planning target volume (PTV), dose delivered to organs at risk (OARs) and normal tissue (NT), monitor unit (MU). A plan-quality metric (PQM) scoring procedure was employed. For the 1.5â T plans, dose verifications were performed using an MR-compatible ArcCHECK phantom.RESULTS:
A smaller dose influence of the magnetic field was found for the circle target, prostate, head-and-neck, and C-shape test cases, compared with the multi-target and lung test cases. In the multi-target test case, the significant dose influence was on the inferior PTV, followed by the superior PTV. There was a relatively large dose influence on the PTV and OARs for lung test case. No statistically significant differences in PQM and MUs were observed. For the 1.5â T plans, gamma passing rates were all higher than 95% with criteria of 2â mm/3% and 2â mm/2%.CONCLUSION:
The presence of a 1.5â T magnetic field had a relatively large impact on dose parameters in the multi-target and lung test cases compared with other test cases. However, there were no significant influences on the plan-quality metric, MU and dose accuracy for all test cases.Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Dosimétrie en radiothérapie
/
Planification de radiothérapie assistée par ordinateur
/
Imagerie par résonance magnétique
/
Fantômes en imagerie
/
Radiothérapie guidée par l'image
/
Champs magnétiques
Limites:
Humans
/
Male
Langue:
En
Journal:
Technol Cancer Res Treat
/
Technology in cancer research & treatment (Online)
Sujet du journal:
NEOPLASIAS
/
TERAPEUTICA
Année:
2024
Type de document:
Article
Pays d'affiliation:
Chine
Pays de publication:
États-Unis d'Amérique