Initial experience of using an iron-containing fiducial marker for radiotherapy of prostate cancer: Advantages in the visualization of markers in Computed Tomography and Magnetic Resonance Imaging

• Autorzy: Tanaka O. , Iida T. , Komeda H. , Tamaki M. , Seike K. , Kato D. , Yokoyama T. , Hirose S. , Kawaguchi D.

Identyfikatory

DOI

10.1515/pjmpe-2016-0016

• Języki publikacji: EN

Abstrakty

EN

Visualization of markers is critical for imaging modalities such as computed tomography (CT) and magnetic resonance imaging (MRI). However, the size of the marker varies according to the imaging technique. While a large-sized marker is more useful for visualization in MRI, it results in artifacts on CT and causes substantial pain on administration. In contrast, a small-sized marker reduces the artifacts on CT but hampers MRI detection. Herein, we report a new ironcontaining marker and compare its utility with that of non-iron-containing markers. Five patients underwent CT/MRI fusion-based intensity-modulated radiotherapy, and the markers were placed by urologists. A Gold Anchor™ (GA; diameter, 0.28 mm; length, 10 mm) was placed using a 22G needle on the right side of the prostate. A VISICOIL™ (VIS; diameter, 0.35 mm; length, 10 mm) was placed using a 19G needle on the left side. MRI was performed using T2*-weighted imaging. Three observers evaluated and scored the visual qualities of the acquired images. The mean score of visualization was almost identical between the GA and VIS in radiography and cone-beam CT (Novalis Tx). The artifacts in planning CT were slightly larger using the GA than using the VIS. The visualization of the marker on MRI using the GA was superior to that using the VIS. In conclusion, the visualization quality of radiography, conebeam CT, and planning CT was roughly equal between the GA and VIS. However, the GA was more strongly visualized than was the VIS on MRI due to iron containing.

Słowa kluczowe

EN

prostate radiotherapy; image-guided; MRI; fiducial marker

• Wydawca: Polskie Towarzystwo Fizyki Medycznej
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2016
• Tom: Vol. 22, Iss. 4
• Strony: 93--96
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Tanaka O.

• Department of Radiation Oncology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Iida T.

• Department of Radiation Oncology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Komeda H.

• Department of Urology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Tamaki M.

• Department of Urology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Seike K.

• Department of Urology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Kato D.

• Department of Urology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Yokoyama T.

• Department of Radiation Oncology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Hirose S.

• Department of Radiation Oncology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

autor

Kawaguchi D.

• Department of Radiation Oncology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu City Gifu, 500-8513, Japan

Bibliografia

• [1] Chan MF, Cohen GN, Deasy JO. Qualitative evaluation of fiducial markers for radiotherapy imaging. Technol Cancer Res Treat. 2015;14(3):298-304.
• [2] Ng M, Brown E, Williams A, et al. Fiducial markers and spacers in prostate radiotherapy: current applications. BJU Int. 2014;113(S2):13-20.
• [3] Gurney-Champion OJ, Lens E, van der Horst A, et al. Visibility and artifacts of gold fiducial markers used for image guided radiation therapy of pancreatic cancer on MRI. Med Phys. 2015;42(5):2638-2647.
• [4] Tanaka O, Hayashi S, Matsuo M, et al. Comparison of MRI-based and CT/MRI fusion-based postimplant dosimetric analysis of prostate brachytherapy. Int J Radiat Oncol Biol Phys. 2006;66(2):597-602.
• [5] Tanaka O, Hattori M, Hirose S. Comparison of the MRI sequences in ideal fiducial marker-based radiotherapy for prostate cancer. Radiother Oncol. 2016;119(Supplement1):S858-S859.