Seven-Probe Fiber Detector for Time-Resolved Source Tracking in HDR-Brachytherapy: Experimental Evaluation
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866915350814130176 |
|---|---|
| author | Gonod, Mathieu Suarez, Miguel Angel Laskri, Samir Rolin, Gwenael Charriere, Karine Dordor, Emmanuel Crouzilles, Julien Lihoreau, Thomas Pazart, Lionel Vinchant, Jean-Francois Aubignac, Leone Grosjean, Thierry |
| author_facet | Gonod, Mathieu Suarez, Miguel Angel Laskri, Samir Rolin, Gwenael Charriere, Karine Dordor, Emmanuel Crouzilles, Julien Lihoreau, Thomas Pazart, Lionel Vinchant, Jean-Francois Aubignac, Leone Grosjean, Thierry |
| contents | {\bf Purpose:} This study evaluates a compact biocompatible Seven-probe Scintillator Detector (7SD) for monitoring HDR-BT treatment sequences across a range of dwell times and source-probe spacings representative of most HDR-BT techniques.
{\bf Methods:} The SSD comprises seven detection cells made of Gd$_2$O$_2$S:Tb, each measuring 0.28 $\pm$ 0.02 mm in diameter and 0.43 $\pm$ 0.02 mm in length, coupled to the microstructured tips of silica optical fibers (110-micron diameter). The probes, spaced 15 mm apart along the fiber axis, are organized into a bundle with a total diameter of less than 0.45 mm. The SSD was tested using a MicroSelectron 9.1 Ci Ir-192 HDR afterloader connected to a BT stainless steel interstitial needle. Detection signals were acquired with an sCMOS camera equipped. Monitoring of dwell times and positions was performed by combining detection signals from all seven probes.
{\bf Results:} A total of 4,040 dwell positions were analyzed, covering source-probe spacings from 10 to 36 mm and a source travel range of 62 mm, with dwell times ranging from 0.1 to 19.5 s. The 7SD successfully identified 99.5\% of the dwell positions. In cylindrical coordinates, the measured dwell positions deviated from the planned values by 0.224 $\pm$ 0.155 mm (radial) and 0.077 $\pm$ 0.181 mm (axial, source travel axis). The average deviation from planned dwell times was 0.006 $\pm$ 0.061 s. 99.4\% of the dwell positions were measured within the 1 mm reliability threshold. The remaining 0.6\% of deviations consistently occurred at the initial dwell position of treatment sequences and appear to stem from a systematic source positioning error by the afterloader. Additionally, the detector accurately identified intentional needle mispositioning scenarios with sub-millimeter accuracy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16124 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Seven-Probe Fiber Detector for Time-Resolved Source Tracking in HDR-Brachytherapy: Experimental Evaluation Gonod, Mathieu Suarez, Miguel Angel Laskri, Samir Rolin, Gwenael Charriere, Karine Dordor, Emmanuel Crouzilles, Julien Lihoreau, Thomas Pazart, Lionel Vinchant, Jean-Francois Aubignac, Leone Grosjean, Thierry Medical Physics {\bf Purpose:} This study evaluates a compact biocompatible Seven-probe Scintillator Detector (7SD) for monitoring HDR-BT treatment sequences across a range of dwell times and source-probe spacings representative of most HDR-BT techniques. {\bf Methods:} The SSD comprises seven detection cells made of Gd$_2$O$_2$S:Tb, each measuring 0.28 $\pm$ 0.02 mm in diameter and 0.43 $\pm$ 0.02 mm in length, coupled to the microstructured tips of silica optical fibers (110-micron diameter). The probes, spaced 15 mm apart along the fiber axis, are organized into a bundle with a total diameter of less than 0.45 mm. The SSD was tested using a MicroSelectron 9.1 Ci Ir-192 HDR afterloader connected to a BT stainless steel interstitial needle. Detection signals were acquired with an sCMOS camera equipped. Monitoring of dwell times and positions was performed by combining detection signals from all seven probes. {\bf Results:} A total of 4,040 dwell positions were analyzed, covering source-probe spacings from 10 to 36 mm and a source travel range of 62 mm, with dwell times ranging from 0.1 to 19.5 s. The 7SD successfully identified 99.5\% of the dwell positions. In cylindrical coordinates, the measured dwell positions deviated from the planned values by 0.224 $\pm$ 0.155 mm (radial) and 0.077 $\pm$ 0.181 mm (axial, source travel axis). The average deviation from planned dwell times was 0.006 $\pm$ 0.061 s. 99.4\% of the dwell positions were measured within the 1 mm reliability threshold. The remaining 0.6\% of deviations consistently occurred at the initial dwell position of treatment sequences and appear to stem from a systematic source positioning error by the afterloader. Additionally, the detector accurately identified intentional needle mispositioning scenarios with sub-millimeter accuracy. |
| title | Seven-Probe Fiber Detector for Time-Resolved Source Tracking in HDR-Brachytherapy: Experimental Evaluation |
| topic | Medical Physics |
| url | https://arxiv.org/abs/2506.16124 |