Setup reproducibility in radiation therapy for lung cancer: a comparison between T-bar and expanded foam immobilization devices

Halperin, Ross; Roa, Wilson; Field, Melissa; Hanson, John; Murray, B.

doi:10.1016/s0360-3016(98)00354-x

Cited by 50 publications

(34 citation statements)

References 11 publications

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“…Interfractional positional variation data were normally distributed; thus, the mean and standard deviation (SD) were appropriate descriptive statistics. To evaluate interfractional positional reproducibility at end-inhalation and end-exhalation, the SDs of the interfractional positional variation at end-inhalation were compared with those at end-exhalation for each direction using the F test (28). Values of p < 0.05 were considered statistically significant.…”

Section: Statistical Analysesmentioning

confidence: 99%

Interfractional Reproducibility in Pancreatic Position Based on Four-Dimensional Computed Tomography

Shiinoki

Shibuya

Nakamura

et al. 2011

International Journal of Radiation Oncology*Biology*Physics

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Section: Statistical Analysesmentioning

confidence: 99%

Interfractional Reproducibility in Pancreatic Position Based on Four-Dimensional Computed Tomography

Shiinoki

Shibuya

Nakamura

et al. 2011

International Journal of Radiation Oncology*Biology*Physics

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“…Although systematic errors can be reduced by rigorous examination of field control films, random errors can be reduced by improvement of patient immobilization and precise daily positioning on the treatment table. Few studies have been conducted in the context of chest disease (7,9,13,20,(23)(24)(25)(26). A review of the results of studies regarding patient set-up verification has been reported by Hurkmans et al (2).…”

Section: Discussionmentioning

confidence: 99%

“…On the basis of the studies reported in the literature, 3 strategies have been proposed: a) reduction of set-up uncertainties by an effective immobilization system (1,4); b) quantification of these uncertainties which are then taken into account in the final calculation of safety margins (5); and c) measure and correction of errors during treatment itself with a strict set-up correction protocol (5). These 3 approaches are complementary and not exclusive, since an immobilization system cannot eliminate set-up uncertainties (6)(7)(8). Residual errors must be measured then integrated into treatment planning decisions.…”

Section: Introductionmentioning

confidence: 99%

Conformal Radiotherapy Planning for Lung Cancer: Analysis of Set-Up Uncertainties

Giraud

Rycke

Rosenwald

et al. 2007

Cancer Investigation

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The objective of this study was to evaluate set-up uncertainties using a portal imaging system in a population of inoperable non-small cell lung cancer. Twenty-one patients were treated by a conformal radiotherapy technique with a personalized immobilization cast. The beam was verified by comparison with a corresponding digitally reconstructed radiograph by superimposition of anatomical structures. One thousand eight hundred eighty three images were analyzed. The mean intrafraction and interfraction errors (+/-SD) were 2.17 mm and 0.9 +/- 3.7 mm, 2.3 mm and 0.9 +/- 3.1 mm, 3 mm and 0.7 +/- 3 mm on the lateral (x), cranio-caudal (y) and anterior-posterior (z) axes, respectively. The mean systematic error was small, less than 1 mm, in all directions. The random errors were 2.5 mm, 2.4 mm, and 1.8 mm on the x, y, and z axes, respectively. No correlation between errors and the patient's height, weight, age, or sex was found. Set-up errors accuracy depending on practices, each institution should review their own treatments to quantify and reduce set-up errors in clinical practice.

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“…Infrared markers were affixed to the patient's skin at the time of CT simulation in the pattern shown in Figure 1 At the time of simulation, patients were immobilized with a wingboard and vacuum immobilization bag (Vac-loc bag, MedTec, Orange City, IO) for the upper torso. [18] The five infrared iGPS markers were affixed to the patient's skin at the time of computed tomography (CT) simulation, and the position and location of each infrared marker was located by iGPS within the simulator room.…”

Section: Methodsmentioning

confidence: 99%

Prospective Study of Infrared-Guided Patient Setup for Fractionated Thoracic Radiation

Chen¹,

Lyatskaya²,

Killoran³

et al. 2017

IJMPCERO

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Objective: The standard practice in fractionated radiation of using of visual alignment of tattoos with weekly portal imaging for radiation setup can miss setup errors. We previously reported on the feasibility of using an automated infrared-guided positioning system (iGPS) for daily radiation setup. In this study, we prospectively evaluate whether use of iGPS can improve daily setup errors for patients with thoracic malignancies. Methods: Multiple external infrared markers were placed on patients undergoing thoracic radiation at the time of simulation. Patients were immobilized using vacuum immobilization bag and wing-board. Patients were aligned for treatment using only the iGPS system. Daily portal images were then taken, and shifts in patient position were recorded. Differences between isocenter position using iGPS versus daily portal imaging were calculated. Results: Data were collected for 698 treatment sessions for 27 patients. We found that in 94.0%, 96.4%, and 93.7% of treatment sessions, isocenter position differed between iGPS and daily portal imaging by ≤5 mm in the left/right(L/R), anterior/posterior(A/P), and superior/inferior(S/I) directions, respectively. Isocenter position differed by 5 -10 mm in 5.7% (L/R), 3.6% (A/P), and 5.9% (S/I) of treatment sessions, and by >10 mm in 0.3% (L/R), 0.0% (A/P), and 0.4% (S/I) of treatment sessions. Three-dimensional shifts were also calculated, with differences in isocenter position as follows: 94.9% ≤5 mm, 5.1% 5 -10 mm, and 0.2% >10 mm. This compares favorably to our prior studies. Discussion: Daily treatment setup using an infrared-guided patient positioning system, correlates well with daily portal imaging and may help to improve daily treatment setup for patients with thoracic malignancies.

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Setup reproducibility in radiation therapy for lung cancer: a comparison between T-bar and expanded foam immobilization devices

Cited by 50 publications

References 11 publications

Interfractional Reproducibility in Pancreatic Position Based on Four-Dimensional Computed Tomography

Interfractional Reproducibility in Pancreatic Position Based on Four-Dimensional Computed Tomography

Conformal Radiotherapy Planning for Lung Cancer: Analysis of Set-Up Uncertainties

Prospective Study of Infrared-Guided Patient Setup for Fractionated Thoracic Radiation

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