Abstract
Setup variability affects the appropriate delivery of radiation and informs the setup margin required to treat radiation patients. Twenty-four veterinary patients with head and neck cancers were enrolled in this prospective, cross-sectional study to determine the accuracy of an indexed board immobilization device for positioning. Couch position values were defined at the first treatment based on setup films. At subsequent treatments, patients were moved to the previously defined couch location, orthogonal films were acquired, table position was modified, and displacement was recorded. The mean systematic displacement, random displacement, overall displacement, and mean displacement values of the three-dimensional (3D) vector were calculated. Three hundred thirty-two pairs of orthogonal setup films were analyzed for displacement in cranial-caudal, lateral, and dorsal-ventral directions. The mean systematic displacements were 0.5, 0.8, and 0.5 mm, respectively. The mean random displacements were 1.0, 1.1, and 0.7 mm, respectively. The overall displacements were 1.1, 1.4, and 0.9 mm, respectively. The mean 3D vector value was 1.6 mm with a standard deviation of 1.2 mm. Ninety-five percent of the vectors were <3.6 mm. These values were compared to data obtained with a previously used immobilization device. A t-test was used to compare the two devices. The 3D vector, random displacement in all directions, and overall displacement in the cranial-caudal and dorsal-ventral directions were significantly smaller than displacements with the previous device. The precision and accuracy of the indexed board device was superior to the historical head and neck device.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 448-455 |
| Number of pages | 8 |
| Journal | Veterinary Radiology and Ultrasound |
| Volume | 56 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jul 1 2015 |
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Keywords
- Immobilization
- Indexed
- Positioning
- Radiation
- Veterinary
ASJC Scopus subject areas
- veterinary(all)
Cite this
Validation of an indexed radiotherapy head positioning device for use in dogs and cats. / Hansen, Katherine S; Theon, Alain P; Dieterich, Sonja; Kent, Michael S.
In: Veterinary Radiology and Ultrasound, Vol. 56, No. 4, 01.07.2015, p. 448-455.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Validation of an indexed radiotherapy head positioning device for use in dogs and cats
AU - Hansen, Katherine S
AU - Theon, Alain P
AU - Dieterich, Sonja
AU - Kent, Michael S
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Setup variability affects the appropriate delivery of radiation and informs the setup margin required to treat radiation patients. Twenty-four veterinary patients with head and neck cancers were enrolled in this prospective, cross-sectional study to determine the accuracy of an indexed board immobilization device for positioning. Couch position values were defined at the first treatment based on setup films. At subsequent treatments, patients were moved to the previously defined couch location, orthogonal films were acquired, table position was modified, and displacement was recorded. The mean systematic displacement, random displacement, overall displacement, and mean displacement values of the three-dimensional (3D) vector were calculated. Three hundred thirty-two pairs of orthogonal setup films were analyzed for displacement in cranial-caudal, lateral, and dorsal-ventral directions. The mean systematic displacements were 0.5, 0.8, and 0.5 mm, respectively. The mean random displacements were 1.0, 1.1, and 0.7 mm, respectively. The overall displacements were 1.1, 1.4, and 0.9 mm, respectively. The mean 3D vector value was 1.6 mm with a standard deviation of 1.2 mm. Ninety-five percent of the vectors were <3.6 mm. These values were compared to data obtained with a previously used immobilization device. A t-test was used to compare the two devices. The 3D vector, random displacement in all directions, and overall displacement in the cranial-caudal and dorsal-ventral directions were significantly smaller than displacements with the previous device. The precision and accuracy of the indexed board device was superior to the historical head and neck device.
AB - Setup variability affects the appropriate delivery of radiation and informs the setup margin required to treat radiation patients. Twenty-four veterinary patients with head and neck cancers were enrolled in this prospective, cross-sectional study to determine the accuracy of an indexed board immobilization device for positioning. Couch position values were defined at the first treatment based on setup films. At subsequent treatments, patients were moved to the previously defined couch location, orthogonal films were acquired, table position was modified, and displacement was recorded. The mean systematic displacement, random displacement, overall displacement, and mean displacement values of the three-dimensional (3D) vector were calculated. Three hundred thirty-two pairs of orthogonal setup films were analyzed for displacement in cranial-caudal, lateral, and dorsal-ventral directions. The mean systematic displacements were 0.5, 0.8, and 0.5 mm, respectively. The mean random displacements were 1.0, 1.1, and 0.7 mm, respectively. The overall displacements were 1.1, 1.4, and 0.9 mm, respectively. The mean 3D vector value was 1.6 mm with a standard deviation of 1.2 mm. Ninety-five percent of the vectors were <3.6 mm. These values were compared to data obtained with a previously used immobilization device. A t-test was used to compare the two devices. The 3D vector, random displacement in all directions, and overall displacement in the cranial-caudal and dorsal-ventral directions were significantly smaller than displacements with the previous device. The precision and accuracy of the indexed board device was superior to the historical head and neck device.
KW - Immobilization
KW - Indexed
KW - Positioning
KW - Radiation
KW - Veterinary
UR - http://www.scopus.com/inward/record.url?scp=84936214724&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84936214724&partnerID=8YFLogxK
U2 - 10.1111/vru.12257
DO - 10.1111/vru.12257
M3 - Article
VL - 56
SP - 448
EP - 455
JO - Veterinary Radiology and Ultrasound
JF - Veterinary Radiology and Ultrasound
SN - 1058-8183
IS - 4
ER -