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SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy
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| Zeitschriftentitel: | Medical Physics |
|---|---|
| Personen und Körperschaften: | , |
| In: | Medical Physics, 42, 2015, 6Part10, S. 3308-3308 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
|
| Schlagwörter: |
| author_facet |
Manning, M Maurer, J Manning, M Maurer, J |
|---|---|
| author |
Manning, M Maurer, J |
| spellingShingle |
Manning, M Maurer, J Medical Physics SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy General Medicine |
| author_sort |
manning, m |
| spelling |
Manning, M Maurer, J 0094-2405 2473-4209 Wiley General Medicine http://dx.doi.org/10.1118/1.4924273 <jats:sec><jats:title>Purpose:</jats:title><jats:p>Fractionated stereotactic radiotherapy (FSRT) for optic nerve tumors can potentially use planning target volume (PTV) expansions as small as 1–5 mm. However, the motion of the intraorbital segment of the optic nerve has not been studied.</jats:p></jats:sec><jats:sec><jats:title>Methods:</jats:title><jats:p>A subject with a right optic nerve sheath meningioma underwent CT simulation in three fixed gaze positions: right, left, and fixed forward at a marker. The gross tumor volume (GTV) and the organs‐at‐risk (OAR) were contoured on all three scans. An IMRT plan using 10 static non‐coplanar fields to 50.4 Gy in 28 fractions was designed to treat the fixed‐forward gazing GTV with a 1 mm PTV, then resulting coverage was evaluated for the GTV in the three positions. As an alternative, the composite structures were computed to generate the internal target volume (ITV), 1 mm expansion free‐gazing PTV, and planning organat‐risk volumes (PRVs) for free‐gazing treatment. A comparable IMRT plan was created for the free‐gazing PTV.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>If the patient were treated using the fixed forward gaze plan looking straight, right, and left, the V100% for the GTV was 100.0%, 33.1%, and 0.1%, respectively. The volumes of the PTVs for fixed gaze and free‐gazing plans were 0.79 and 2.21 cc, respectively, increasing the PTV by a factor of 2.6. The V100% for the fixed gaze and free‐gazing plans were 0.85 cc and 2.8 cc, respectively increasing the treated volume by a factor of 3.3.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>Fixed gaze treatment appears to provide greater organ sparing than free‐gazing. However unanticipated intrafraction right or left gaze can produce a geometric miss. Further study of optic nerve motion appears to be warranted in areas such as intrafraction optical confirmation of fixed gaze and optimized gaze directions to minimize lens and other normal organ dose in cranial radiotherapy.</jats:p></jats:sec> SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy Medical Physics |
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10.1118/1.4924273 |
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Online |
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Wiley, 2015 |
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Wiley, 2015 |
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2473-4209 0094-2405 |
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2015 |
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Wiley |
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ai |
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Medical Physics |
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49 |
| title |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_unstemmed |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_full |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_fullStr |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_full_unstemmed |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_short |
SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_sort |
su‐e‐j‐187: management of optic organ motion in fractionated stereotactic radiotherapy |
| topic |
General Medicine |
| url |
http://dx.doi.org/10.1118/1.4924273 |
| publishDate |
2015 |
| physical |
3308-3308 |
| description |
<jats:sec><jats:title>Purpose:</jats:title><jats:p>Fractionated stereotactic radiotherapy (FSRT) for optic nerve tumors can potentially use planning target volume (PTV) expansions as small as 1–5 mm. However, the motion of the intraorbital segment of the optic nerve has not been studied.</jats:p></jats:sec><jats:sec><jats:title>Methods:</jats:title><jats:p>A subject with a right optic nerve sheath meningioma underwent CT simulation in three fixed gaze positions: right, left, and fixed forward at a marker. The gross tumor volume (GTV) and the organs‐at‐risk (OAR) were contoured on all three scans. An IMRT plan using 10 static non‐coplanar fields to 50.4 Gy in 28 fractions was designed to treat the fixed‐forward gazing GTV with a 1 mm PTV, then resulting coverage was evaluated for the GTV in the three positions. As an alternative, the composite structures were computed to generate the internal target volume (ITV), 1 mm expansion free‐gazing PTV, and planning organat‐risk volumes (PRVs) for free‐gazing treatment. A comparable IMRT plan was created for the free‐gazing PTV.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>If the patient were treated using the fixed forward gaze plan looking straight, right, and left, the V100% for the GTV was 100.0%, 33.1%, and 0.1%, respectively. The volumes of the PTVs for fixed gaze and free‐gazing plans were 0.79 and 2.21 cc, respectively, increasing the PTV by a factor of 2.6. The V100% for the fixed gaze and free‐gazing plans were 0.85 cc and 2.8 cc, respectively increasing the treated volume by a factor of 3.3.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>Fixed gaze treatment appears to provide greater organ sparing than free‐gazing. However unanticipated intrafraction right or left gaze can produce a geometric miss. Further study of optic nerve motion appears to be warranted in areas such as intrafraction optical confirmation of fixed gaze and optimized gaze directions to minimize lens and other normal organ dose in cranial radiotherapy.</jats:p></jats:sec> |
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| author | Manning, M, Maurer, J |
| author_facet | Manning, M, Maurer, J, Manning, M, Maurer, J |
| author_sort | manning, m |
| container_issue | 6Part10 |
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| description | <jats:sec><jats:title>Purpose:</jats:title><jats:p>Fractionated stereotactic radiotherapy (FSRT) for optic nerve tumors can potentially use planning target volume (PTV) expansions as small as 1–5 mm. However, the motion of the intraorbital segment of the optic nerve has not been studied.</jats:p></jats:sec><jats:sec><jats:title>Methods:</jats:title><jats:p>A subject with a right optic nerve sheath meningioma underwent CT simulation in three fixed gaze positions: right, left, and fixed forward at a marker. The gross tumor volume (GTV) and the organs‐at‐risk (OAR) were contoured on all three scans. An IMRT plan using 10 static non‐coplanar fields to 50.4 Gy in 28 fractions was designed to treat the fixed‐forward gazing GTV with a 1 mm PTV, then resulting coverage was evaluated for the GTV in the three positions. As an alternative, the composite structures were computed to generate the internal target volume (ITV), 1 mm expansion free‐gazing PTV, and planning organat‐risk volumes (PRVs) for free‐gazing treatment. A comparable IMRT plan was created for the free‐gazing PTV.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>If the patient were treated using the fixed forward gaze plan looking straight, right, and left, the V100% for the GTV was 100.0%, 33.1%, and 0.1%, respectively. The volumes of the PTVs for fixed gaze and free‐gazing plans were 0.79 and 2.21 cc, respectively, increasing the PTV by a factor of 2.6. The V100% for the fixed gaze and free‐gazing plans were 0.85 cc and 2.8 cc, respectively increasing the treated volume by a factor of 3.3.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>Fixed gaze treatment appears to provide greater organ sparing than free‐gazing. However unanticipated intrafraction right or left gaze can produce a geometric miss. Further study of optic nerve motion appears to be warranted in areas such as intrafraction optical confirmation of fixed gaze and optimized gaze directions to minimize lens and other normal organ dose in cranial radiotherapy.</jats:p></jats:sec> |
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| imprint | Wiley, 2015 |
| imprint_str_mv | Wiley, 2015 |
| institution | DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1 |
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| publishDate | 2015 |
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| source_id | 49 |
| spelling | Manning, M Maurer, J 0094-2405 2473-4209 Wiley General Medicine http://dx.doi.org/10.1118/1.4924273 <jats:sec><jats:title>Purpose:</jats:title><jats:p>Fractionated stereotactic radiotherapy (FSRT) for optic nerve tumors can potentially use planning target volume (PTV) expansions as small as 1–5 mm. However, the motion of the intraorbital segment of the optic nerve has not been studied.</jats:p></jats:sec><jats:sec><jats:title>Methods:</jats:title><jats:p>A subject with a right optic nerve sheath meningioma underwent CT simulation in three fixed gaze positions: right, left, and fixed forward at a marker. The gross tumor volume (GTV) and the organs‐at‐risk (OAR) were contoured on all three scans. An IMRT plan using 10 static non‐coplanar fields to 50.4 Gy in 28 fractions was designed to treat the fixed‐forward gazing GTV with a 1 mm PTV, then resulting coverage was evaluated for the GTV in the three positions. As an alternative, the composite structures were computed to generate the internal target volume (ITV), 1 mm expansion free‐gazing PTV, and planning organat‐risk volumes (PRVs) for free‐gazing treatment. A comparable IMRT plan was created for the free‐gazing PTV.</jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p>If the patient were treated using the fixed forward gaze plan looking straight, right, and left, the V100% for the GTV was 100.0%, 33.1%, and 0.1%, respectively. The volumes of the PTVs for fixed gaze and free‐gazing plans were 0.79 and 2.21 cc, respectively, increasing the PTV by a factor of 2.6. The V100% for the fixed gaze and free‐gazing plans were 0.85 cc and 2.8 cc, respectively increasing the treated volume by a factor of 3.3.</jats:p></jats:sec><jats:sec><jats:title>Conclusion:</jats:title><jats:p>Fixed gaze treatment appears to provide greater organ sparing than free‐gazing. However unanticipated intrafraction right or left gaze can produce a geometric miss. Further study of optic nerve motion appears to be warranted in areas such as intrafraction optical confirmation of fixed gaze and optimized gaze directions to minimize lens and other normal organ dose in cranial radiotherapy.</jats:p></jats:sec> SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy Medical Physics |
| spellingShingle | Manning, M, Maurer, J, Medical Physics, SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy, General Medicine |
| title | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_full | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_fullStr | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_full_unstemmed | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_short | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| title_sort | su‐e‐j‐187: management of optic organ motion in fractionated stereotactic radiotherapy |
| title_unstemmed | SU‐E‐J‐187: Management of Optic Organ Motion in Fractionated Stereotactic Radiotherapy |
| topic | General Medicine |
| url | http://dx.doi.org/10.1118/1.4924273 |