open access

Vol 25, No 1 (2020)
Original research articles
Published online: 2020-01-01
Submitted: 2019-05-07
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Comparison of CT artifacts and image recognition of various fiducial markers including two types of thinner fiducial markers for CyberKnife treatment

Toshihiro Suzuki, Masahide Saito, Hiroshi Onishi, Koji Mochizuki, Kenichiro Satani, Akihiro Yamazaki, Kenichi Miura, Shinji Taka, Naoki Sano, Takafumi Komiyama, Hiroshi Takahashi
DOI: 10.1016/j.rpor.2019.12.005
·
Rep Pract Oncol Radiother 2020;25(1):117-124.

open access

Vol 25, No 1 (2020)
Original research articles
Published online: 2020-01-01
Submitted: 2019-05-07

Abstract

Aim

The aim of the study was to evaluate computed tomography (CT) artifacts and image recognition of the CyberKnife system. Regarding fiducial markers, VISICOIL of 0.5mm×5.0mm and 0.75mm×5.0mm, ball-shaped Gold Anchor (GA) of 0.28mm×10mm and 0.28mm×20mm, were compared with the standard cylinder marker of 0.9mm×3.0mm (ACCULOC).

Background

Recently, various kinds of commercial fiducial markers have been available in CyberKnife treatment.

Materials and methods

The CT images of a water equivalent gel with each fiducial marker were acquired for the evaluation of CT artifacts. The evaluation was performed using the standard deviation of Hounsfield Unit (HU) value for a rectangle region near the fiducial marker. Then, to evaluate the image recognition, each fiducial marker was located to overlap in the target locating system (TLS) for the two sites; the vertebral bone and the pubic bone.

Results

For CT artifacts, the standard deviations of the VISICOIL of 0.5mm×5.0mm was the smallest. The image recognition of four fiducial markers had a value close to the standard cylinder marker and was feasible for common use, but was slightly poorer when using GA of 0.28mm×10mm in the dynamic conditions.

Conclusion

Our results indicated that VISICOIL 0.5×5.0mm and the GAs can be used nearly always for CyberKnife treatment in spite of their much thinner needles than those of cylinder types.

Abstract

Aim

The aim of the study was to evaluate computed tomography (CT) artifacts and image recognition of the CyberKnife system. Regarding fiducial markers, VISICOIL of 0.5mm×5.0mm and 0.75mm×5.0mm, ball-shaped Gold Anchor (GA) of 0.28mm×10mm and 0.28mm×20mm, were compared with the standard cylinder marker of 0.9mm×3.0mm (ACCULOC).

Background

Recently, various kinds of commercial fiducial markers have been available in CyberKnife treatment.

Materials and methods

The CT images of a water equivalent gel with each fiducial marker were acquired for the evaluation of CT artifacts. The evaluation was performed using the standard deviation of Hounsfield Unit (HU) value for a rectangle region near the fiducial marker. Then, to evaluate the image recognition, each fiducial marker was located to overlap in the target locating system (TLS) for the two sites; the vertebral bone and the pubic bone.

Results

For CT artifacts, the standard deviations of the VISICOIL of 0.5mm×5.0mm was the smallest. The image recognition of four fiducial markers had a value close to the standard cylinder marker and was feasible for common use, but was slightly poorer when using GA of 0.28mm×10mm in the dynamic conditions.

Conclusion

Our results indicated that VISICOIL 0.5×5.0mm and the GAs can be used nearly always for CyberKnife treatment in spite of their much thinner needles than those of cylinder types.

Get Citation

Keywords

Fiducial marker; CyberKnife; VISICOIL; Gold Anchor; SBRT; CT artifact

About this article
Title

Comparison of CT artifacts and image recognition of various fiducial markers including two types of thinner fiducial markers for CyberKnife treatment

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 25, No 1 (2020)

Pages

117-124

Published online

2020-01-01

DOI

10.1016/j.rpor.2019.12.005

Bibliographic record

Rep Pract Oncol Radiother 2020;25(1):117-124.

Keywords

Fiducial marker
CyberKnife
VISICOIL
Gold Anchor
SBRT
CT artifact

Authors

Toshihiro Suzuki
Masahide Saito
Hiroshi Onishi
Koji Mochizuki
Kenichiro Satani
Akihiro Yamazaki
Kenichi Miura
Shinji Taka
Naoki Sano
Takafumi Komiyama
Hiroshi Takahashi

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