Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study
The patient specific quality assurance (PSQA) is a pre-treatment procedure performed to evaluate the validity of the inversed treatment plans, before the actual radiotherapy (RT) treatment delivery, to ensure the patient’s safety. The current method applied for the PSQA assessment in Hospital Univer...
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| Format: | Monograph |
| Language: | English |
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Universiti Sains Malaysia
2024
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| Online Access: | http://eprints.usm.my/61371/ http://eprints.usm.my/61371/1/Siti%20Yuni%20Sara%20Mukhtar-E.pdf |
| _version_ | 1848884693166981120 |
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| author | Mukhtar, Siti Yuni Sara |
| author_facet | Mukhtar, Siti Yuni Sara |
| author_sort | Mukhtar, Siti Yuni Sara |
| building | USM Institutional Repository |
| collection | Online Access |
| description | The patient specific quality assurance (PSQA) is a pre-treatment procedure performed to evaluate the validity of the inversed treatment plans, before the actual radiotherapy (RT) treatment delivery, to ensure the patient’s safety. The current method applied for the PSQA assessment in Hospital Universiti Sains Malaysia (HUSM) department is the ArcCHECK phantom based measurement using 3%/3mm gamma index (GI) analysis and currently, there is no standard procedure to perform the PSQA assessment. The aim of this study is to investigate the GI parameters (3%/3mm, 3%/2mm, 2%/2mm, 2%/1mm and 1%/1mm) in Volumetric modulated arc therapy (VMAT), intensity-modulated radiation therapy (IMRT) and Stereotactic body radiation therapy (SBRT) across various treatment regions retrospectively. The gamma passing rate (GPR) of 95% is the universal tolerance limit provide by the American Association of Physicist in Medicine Task Group 218 (AAPM TG-218). The GPR result indicated the PSQA cases were able to fulfill the 95% limit when 3%/3mm 3%/2mm and 2%/2mm GI parameter were applied with the result of 92.5% (99 cases), 100% (29 cases) and 87.5% (14 cases) for 3%/3mm, 82 cases (82.8%),18 cases (62.1%) and 8 cases (57.1%) for 3%/2mm, meanwhile for 2%/2mm, 46 cases (46.5%), 6 cases (20.7%) and 6 cases (42.9%) respectively for VMAT, IMRT and SBRT. Consequently, the GPR tolerance limit were also evaluated and reflected that 3%/2mm (≥95%), and 2%/2mm (>90%) is applicable for IMRT, VMAT and SBRT as the tolerance limit aligns with the suggestion by the previous study. Subsequently, The GPR tolerance limit for different treatment technique indicates a significant difference (p<0.05) in tolerance limit between IMRT and VMAT when applied using 3%/2mm (≥97.19%) and (≥94.85%), 2%/2mm (≥93.74%) and (≥90.39%). Moreover, The GPR tolerance limit for different treatment region reflect a significant different (p<0.05) when VMAT 3%/2mm is applied for HN (≥97 %), Pelvic (≥ 96%) and Chest (≥ 98%). In conclusion this study proves that apart from 3%/3mm (≥95%), 3%/2mm (≥95%) and 2%/2mm (>90%) are suitable for IMRT, VMAT and SBRT cases for all treatment region to be applied in HUSM, except for IMRT and VMAT when applied on HN region, as well as for VMAT when applied on HN, pelvic and chest region using 3%/2mm. |
| first_indexed | 2025-11-15T19:10:45Z |
| format | Monograph |
| id | usm-61371 |
| institution | Universiti Sains Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T19:10:45Z |
| publishDate | 2024 |
| publisher | Universiti Sains Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | usm-613712025-01-07T03:23:05Z http://eprints.usm.my/61371/ Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study Mukhtar, Siti Yuni Sara R Medicine RC71-78.7 Examination. Diagnosis Including raiography The patient specific quality assurance (PSQA) is a pre-treatment procedure performed to evaluate the validity of the inversed treatment plans, before the actual radiotherapy (RT) treatment delivery, to ensure the patient’s safety. The current method applied for the PSQA assessment in Hospital Universiti Sains Malaysia (HUSM) department is the ArcCHECK phantom based measurement using 3%/3mm gamma index (GI) analysis and currently, there is no standard procedure to perform the PSQA assessment. The aim of this study is to investigate the GI parameters (3%/3mm, 3%/2mm, 2%/2mm, 2%/1mm and 1%/1mm) in Volumetric modulated arc therapy (VMAT), intensity-modulated radiation therapy (IMRT) and Stereotactic body radiation therapy (SBRT) across various treatment regions retrospectively. The gamma passing rate (GPR) of 95% is the universal tolerance limit provide by the American Association of Physicist in Medicine Task Group 218 (AAPM TG-218). The GPR result indicated the PSQA cases were able to fulfill the 95% limit when 3%/3mm 3%/2mm and 2%/2mm GI parameter were applied with the result of 92.5% (99 cases), 100% (29 cases) and 87.5% (14 cases) for 3%/3mm, 82 cases (82.8%),18 cases (62.1%) and 8 cases (57.1%) for 3%/2mm, meanwhile for 2%/2mm, 46 cases (46.5%), 6 cases (20.7%) and 6 cases (42.9%) respectively for VMAT, IMRT and SBRT. Consequently, the GPR tolerance limit were also evaluated and reflected that 3%/2mm (≥95%), and 2%/2mm (>90%) is applicable for IMRT, VMAT and SBRT as the tolerance limit aligns with the suggestion by the previous study. Subsequently, The GPR tolerance limit for different treatment technique indicates a significant difference (p<0.05) in tolerance limit between IMRT and VMAT when applied using 3%/2mm (≥97.19%) and (≥94.85%), 2%/2mm (≥93.74%) and (≥90.39%). Moreover, The GPR tolerance limit for different treatment region reflect a significant different (p<0.05) when VMAT 3%/2mm is applied for HN (≥97 %), Pelvic (≥ 96%) and Chest (≥ 98%). In conclusion this study proves that apart from 3%/3mm (≥95%), 3%/2mm (≥95%) and 2%/2mm (>90%) are suitable for IMRT, VMAT and SBRT cases for all treatment region to be applied in HUSM, except for IMRT and VMAT when applied on HN region, as well as for VMAT when applied on HN, pelvic and chest region using 3%/2mm. Universiti Sains Malaysia 2024-06 Monograph NonPeerReviewed application/pdf en http://eprints.usm.my/61371/1/Siti%20Yuni%20Sara%20Mukhtar-E.pdf Mukhtar, Siti Yuni Sara (2024) Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study. Project Report. Universiti Sains Malaysia. (Submitted) |
| spellingShingle | R Medicine RC71-78.7 Examination. Diagnosis Including raiography Mukhtar, Siti Yuni Sara Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title | Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title_full | Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title_fullStr | Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title_full_unstemmed | Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title_short | Investigation of gamma index parameters in patient specific quality assurance (PSQA) for radiotherapy treatment planning technique: retrosective study |
| title_sort | investigation of gamma index parameters in patient specific quality assurance (psqa) for radiotherapy treatment planning technique: retrosective study |
| topic | R Medicine RC71-78.7 Examination. Diagnosis Including raiography |
| url | http://eprints.usm.my/61371/ http://eprints.usm.my/61371/1/Siti%20Yuni%20Sara%20Mukhtar-E.pdf |