Comparison of MRI sequences in ideal fiducial maker-based radiotherapy for prostate cancer

Tanaka, Osamu; Komeda, Hisao; Hattori, Mitsuyoshi; Hirose, Shigeki; Yama, Eiichi

doi:10.1016/j.rpor.2017.10.002

Cited by 8 publications

(12 citation statements)

References 12 publications

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“…In addition, real-time tracking can reduce However, the prostatic outlines are indistinct, and treatment adjustment and contouring of the organs can prove difficult when using CT alone As such, MRI is often used to compensate for any shortcomings of CT [4] [5]. Because the prostatic outlines are clearer on MRI, it is performed after CT and is registered under the guidance of markers.…”

Section: Discussionmentioning

confidence: 99%

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>

Tanaka¹,

Komeda²,

Iida³

et al. 2016

IJMPCERO

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Section: Discussionmentioning

confidence: 99%

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>

Tanaka¹,

Komeda²,

Iida³

et al. 2016

IJMPCERO

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“…We employed a 0.35-mm marker because it was well recognized on cone-beam CT and helped reduce the artifacts on CT. To our knowledge, no previous studies have compared the outcomes of the GA with those of other markers in the same individual, albeit we did find some reports of phantom studies [5].…”

Section: Discussionmentioning

confidence: 68%

“…As such, MRI is often used to compensate for any shortcomings of CT [4,5]. Because the prostatic outlines are clearer on MRI, it is performed after CT and is registered under the guidance of markers.…”

Section: Discussionmentioning

confidence: 99%

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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

Tanaka

Iida

Komeda

et al. 2016

Polish Journal of Medical Physics and Engineering

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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.

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“…However, when fiducial markers are placed in the prostate, their size and iron content may affect image quality 7‐12 . DWI is easily affected by metals; it is therefore important to assess whether marker placement decreases image quality, as MRI may be performed after radiotherapy to monitor disease status 5,8 .…”

Section: Introductionmentioning

confidence: 99%

Radiotherapy for prostate cancer: Effect of gold fiducial markers on diffusion‐weighted magnetic resonance imaging

Tanaka

Maejima

Yama

et al. 2020

Asia-Pac J Clncl Oncology

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Purpose There has been an increase in the use of gold fiducial markers to ensure precise radiotherapy delivery in prostate cancer patients. However, metal artifacts may affect the quality of subsequent imaging used to assess disease status following treatment. In this study, we evaluated the effect of gold fiducial markers on magnetic resonance imaging (MRI), particularly on diffusion‐weighted imaging (DWI). Material and methods Among 57 patients with prostate cancer, 21 patients in whom two gold markers were placed in the prostate tumor with abnormal signal intensity on DWI were evaluated. The effect of the markers on DWI was evaluated on a scale of 1‐5, with a high score indicating clinical usefulness. Change inapparent diffusion coefficient (ADC; 10−3 mm2/s) from before to after marker placement was also evaluated. Results The mean effect of the markers on DWI was 4.3 (standard deviation [SD] 1.3, range 2–5) points. The mean change in ADC was 0.045 (SD 0.041, range 0.025‐0.089) × 10−3 mm2/s. Conclusions The gold fiducial markers demonstrated negligible effect on DWI quality. Therefore, gold markers do not affect MRI quality, particularly DWI, and may be used during follow‐up in prostate cancer patients.

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Comparison of MRI sequences in ideal fiducial maker-based radiotherapy for prostate cancer

Abstract: T22D and T23D are superior to the other sequences for prostate contouring and marker identification. Therefore, we recommend initial T23D and T22D examinations.

Cited by 8 publications

References 12 publications

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>

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

Radiotherapy for prostate cancer: Effect of gold fiducial markers on diffusion‐weighted magnetic resonance imaging

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Comparison of MRI sequences in ideal fiducial maker-based radiotherapy for prostate cancer

Abstract: T2*2D and T2*3D are superior to the other sequences for prostate contouring and marker identification. Therefore, we recommend initial T2*3D and T2*2D examinations.

Cited by 8 publications

References 12 publications

RETRACTED: &lt;i&gt;Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy&lt;/i&gt;

RETRACTED: &lt;i&gt;Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy&lt;/i&gt;

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

Radiotherapy for prostate cancer: Effect of gold fiducial markers on diffusion‐weighted magnetic resonance imaging

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Abstract: T22D and T23D are superior to the other sequences for prostate contouring and marker identification. Therefore, we recommend initial T23D and T22D examinations.

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>

RETRACTED: <i>Usefulness of Iron-Containing Fiducial Marker for Prostate Radiotherapy</i>