Comparison of geometric uncertainties between alpha cradle and thermoplastic ray cast immobilisation in abdominopelvic radiotherapy: a prospective study.
Context: Setup error significantly affects the accuracy of treatment and outcome in high precision radiotherapy. Aims: To determine total, systematic, random error and clinical target volume (CTV) to planning target volume (PTV) margin with alpha cradle (VL) and ray cast (RC) immobilisation in abdom...
| Publicado en: | Journal of Radiotherapy in Practice Vol. 11; no. 4; pp. 239 - 249 |
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| Autores principales: | , , , , , , |
| Formato: | pictorial research tables/charts randomized controlled trial Journal Article |
| Publicado: |
Cambridge University Press
Dec2012
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104304746&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104304746 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14603969 8OJ jtl: Journal of Radiotherapy in Practice issn: 14603969 maglogo: N pubinfo: dt: Dec2012 vid: 11 iid: 4 pid: 15979 pub: Cambridge University Press artinfo: ui: 104304746 104304746 2011915395 104304746 ppf: 239 ppct: 10 formats: tig: atl: Comparison of geometric uncertainties between alpha cradle and thermoplastic ray cast immobilisation in abdominopelvic radiotherapy: a prospective study. aug: au: Saikat Das Subhashini John Paul Ravindran Rajesh Isiah Rajesh B Selvamani Backianathan Rabi Raja Singh affil: Christian Medical College Vellore, India sug: subj: Abdomen Immobilization Equipment and Supplies Pelvis Radiotherapy Methods Aged Descriptive Statistics Female Human Male Middle Age P-Value Paired T-Tests Randomized Controlled Trials Aged: 65+ years Middle Aged: 45-64 years Female Male ab: Context: Setup error significantly affects the accuracy of treatment and outcome in high precision radiotherapy. Aims: To determine total, systematic, random error and clinical target volume (CTV) to planning target volume (PTV) margin with alpha cradle (VL) and ray cast (RC) immobilisation in abdominopelvic region. Methods and material: Setup error was compared by using digitally reconstructed radiograph (DRR) as reference image with electronic portal image (EPI) taken during the treatment. Statistical analysis used: The total errors in mediolateral (ML), craniocaudal (CC) and anteroposterior (AP) directions were compared by t-test. For systematic and random errors variance ratio test (F-statistics) was used. Margins were calculated using International Commission of Radiation Units (ICRU), Stroom's and van Herk's formula. Results: A total number of 306 portal images were analysed with 144 images in RC group and 162 images in VL group. For VL, in ML, CC, AP directions systematic errors were, in cm, (0.45, 0.29, 0.41), random errors (0.48, 0.32, 0.58), CTV to PTV margins (1.24, 0.80, 1.25), respectively. For RC, systematic errors were (0.25, 0.37, 0.80), random error (0.46, 0.80, 0.33), CTV to PTV margins (0.82, 1.30, 1.08), respectively. The difference of random error in CC and AP directions were statistically significant. Conclusions: Geometric errors and CTV to PTV margins are different in different directions. For abdomen and pelvis in VL immobilisation, the margin ranged from 8 mm to 12.4 mm and for RC it was 8.2 mm to 13 mm. Therefore, a margin of 10 mm with online correction would be adequate. pubtype: Academic Journal doctype: pictorial research tables/charts randomized controlled trial Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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