ArticleStrahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al]2024
Noninvasive inter- and intrafractional motion control in ultrahypofractionated radiation therapy of prostate cancer using RayPilot HypoCath™-a substitute for gold fiducial-based IGRT?
Article in Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al], 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 3 citations in OpenAlex.
- Ultrahypofractionated linac-based radiotherapy of primary prostate cancer - early results of an Austrian nationwide registry study.Clinical and translational radiation oncology · 2026Article
- Dosimetric robustness of urethra sparing in ultrahypofractionated prostate SBRT using catheter-based motion tracking.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2026Article
- CBCT-based online adaptive radiotherapy of the prostate bed: first clinical experience and comparison to nonadaptive conventional IGRT.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2025Article
- Implant geometry and detection rates of prostate fiducial markers after transrectal ultrasound-guided perineal implantation for image-guided 6D-tracking in robotic stereotactic body radiotherapy.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2025Article
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Authors and funding
7 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeIn ultrahypofractionated radiation concepts, managing of intrafractional motion is mandatory because tighter margins are used and random errors resulting from prostate movement are not averaged out over a large number of fractions. Noninvasive live monitoring of prostate movement is a desirable asset for LINAC-based prostate stereotactic body radiation therapy (SBRT).
methodsWe prospectively analyzed a novel live tracking device (RayPilot HypoCath™; Micropos Medical AB, Gothenburg, Sweden) where a transmitter is noninvasively positioned in the prostatic urethra using a Foley catheter in 12 patients undergoing ultrahypofractionated intensity-modulated radiation therapy (IMRT) of the prostate. Gold fiducials (Innovative Technology Völp, Innsbruck, Austria) were implanted to allow comparison of accuracy and positional stability of the HypoCath system and its ability to be used as a standalone IGRT method. Spatial stability of the transponder was assessed by analyzing transmitter movement in relation to gold markers (GM) in superimposed kV image pairs. Inter- and intrafractional prostate movement and the impact of its correction were analyzed.
resultsA total of 64 fractions were analyzed. The average resulting deviation vector compared to the GM-based position was 1.2 mm and 0.7 mm for inter- and intrafractional motion, respectively. The mean intrafractional displacement vector of the prostate was 1.9 mm. Table readjustment due to exceeding the threshold of 3 mm was required in 18.8% of fractions. Repositioning reduced the time spent outside the 3‑mm margin from 7.9% to 3.8% of beam-on time. However, for individual patients, the time spent outside the 3‑mm margin was reduced from to 49% to 19%.
conclusionthe HypoCath system allows highly accurate and robust intrafractional motion monitoring. In conjunction with cone beam CT (CBCT) for initial patient setup, it could be used as a standalone image-guided radiation therapy (IGRT) system.
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