Portal imaging based definition of the planning target volume during pelvic irradiation for gynecological malignancies

Mock, Ulrike; Dieckmann, Karin; Wolff, Uwe; Knocke, Thomas-Hendrik; Pötter, Richard

doi:10.1016/s0360-3016(99)00140-6

Cited by 17 publications

(4 citation statements)

References 23 publications

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“…Generally, the extent of setup error was less than 5 mm on the basis of bony structure, and the most deteriorated axis was the longitudinal or vertical direction. ( 4 – 6 , 9 , 17 – 19 ) A study using the ExacTrac system (Brainlab AG, Feldkirchen, Germany) showed that the main breathing direction in pelvis was from dorsocaudal to anteriorcranial (20) …”

Section: Discussionmentioning

confidence: 99%

“…The appropriate margins along the x‐, y‐ and z‐axes were 3.81, 3.54 and 6.01 mm, respectively. In early phase study using the EPID, Mock et al (4) reported that planning target volume margins of 1 cm appeared to be sufficient, accounting for more that 95% of all deviations. Kaatee et al (18) considered both bony structure and cervical movement using the EPID and cervical marker, and recommended that the appropriate margins along the x‐, y‐, and z‐axes were 10, 12, and 12 mm, respectively.…”

Section: Discussionmentioning

confidence: 99%

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The extent and serial pattern of interfractional variation in patients with whole pelvic irradiation: a study using a kilovoltage orthogonal on‐board imager

Yoon

Yang

Lee

et al. 2012

J Applied Clin Med Phys

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The purpose of this study is to assess the extent and serial pattern of setup error of conventional fractionated whole pelvic irradiation using a kilovoltage on‐board imager. The daily on‐board images of 69 patients were matched with the digitally reconstructed radiographs of simulation on the basis of pelvic bony structure. The shifts along x‐ (lateral), y‐ (longitudinal), and z‐ (vertical) axes, and the 3D vector, were measured. The shift between an origin of the first fraction and each fraction (normalΔshift1st) and the shift between an isocenter of simulation and each fraction (normalΔshiftSimfalse) were calculated. To evaluate serial changes, the shifts of each fraction were classified into four consecutive sessions, and an ANOVA and chi‐square test were used. The systematic error of the normalΔshiftSim and normalΔshift1st were 2.72 and 1.43 mm along the x‐axis, 2.98 and 1.28 mm along the y‐axis, and 4.26 and 2.39 mm along the z‐axis, respectively. The normalΔshiftSim and normalΔshift1st≥50.2emmm of the 3D vector occurred in 54.3% and 23.1%, respectively. The recommended margins to cover setup error in case of using normalΔshift1st were 3.81, 3.54, and 6.01 mm along x‐, y‐, and z‐axes, whereas those using normalΔshiftSim were 6.39, 6.95, and 9.95 mm, respectively. With the passage of time, the normalΔshift1st≥50.2emmm of 3D vector and along any axis in supine setup increased from 14.1% for first session to 22.5% for fourth session (p=0.027false) and from 10.8% to 18.5% (p=0.034false), respectively. In prone setup, first session was better than others in the normalΔshift1st≥5mm of 3D vector and along any axis. It is expected that the correction using the on‐board images on the first fraction improves geometrical uncertainties and reduces the margin for target coverage. Daily continuous OBI follow‐up during conventional fractionated pelvic irradiation can increase the reproducibility and be more effective in the late period.PACS number: 87.55.km

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The extent and serial pattern of interfractional variation in patients with whole pelvic irradiation: a study using a kilovoltage orthogonal on‐board imager

Yoon

Yang

Lee

et al. 2012

J Applied Clin Med Phys

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“…By contrast, electronic portal imaging allows an analysis of the dynamics of patient irradiation such as patient-or organ motion. Electronic portal image devices also offer a fixed parallel film-focus positioning including minimal deviations due to the gantry position, thus making the calculation of setup errors possible [14,21].…”

Section: Discussionmentioning

confidence: 99%

The Electronic Portal Imaging System Siemens Beamview Plus ® Versus the Conventional Verification Films CEA-TVS ® and DuPont CQL-7 ®

Gagel

Schramm

Harms

et al. 2002

Strahlentherapie und Onkologie

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As data of EPIDS are digital, images can be postprocessed and enhanced in a wide variety of ways. Using this tool the electronic portal imaging device provides images that, in terms of visual image quality, are at least comparable to the two evaluated types of radiographic films and also have the added advantage that such images are stored and can be transferred electronically being presupposition for digital patient documentation.

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“…Consequently, the efficiency and quality of radiotherapy cannot be ensured [3][4][5][6]. Recently, increasing attention is paid to utilize the electronic portal imaging device (EPID) to assist positioning [7][8][9][10], but this device is generally used to analyze the positioning error off-line and also suffers from high cost. The video imaging positioning system, which is based on photogrammetric theory and computer vision technique, is a non-contact measurement means, and convenient, fast, realtime and accurate.…”

Section: Introductionmentioning

confidence: 99%

Repeated positioning in accurate radiotherapy based on virtual net technique and contrary reconstruction scheme

Shen

Chen

et al. 2006

Computerized Medical Imaging and Graphics

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Portal imaging based definition of the planning target volume during pelvic irradiation for gynecological malignancies

Cited by 17 publications

References 23 publications

The extent and serial pattern of interfractional variation in patients with whole pelvic irradiation: a study using a kilovoltage orthogonal on‐board imager

The extent and serial pattern of interfractional variation in patients with whole pelvic irradiation: a study using a kilovoltage orthogonal on‐board imager

The Electronic Portal Imaging System Siemens Beamview Plus ® Versus the Conventional Verification Films CEA-TVS ® and DuPont CQL-7 ®

Repeated positioning in accurate radiotherapy based on virtual net technique and contrary reconstruction scheme

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