A comparative study of three CT and MRI registration algorithms in nasopharyngeal carcinoma

Wang, Xiao Shen; Li, Long Gen; Hu, Chao; Qiu, Jianjian; Xu, Zhi Yong; Feng, Yanqiu

doi:10.1120/jacmp.v10i2.2906

Cited by 29 publications

(18 citation statements)

References 23 publications

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“…A separate scan covering the whole phantom was acquired in the body coil for comparison. Images were transferred to the Xio® planning system (Elekta AB, Stockholm, Sweden) and fused using mutual information [18]. Figure 1 shows an image of the distortion phantom along with maps of the difference between the known and measured distances at each grid location.…”

Section: Materials and Methods/volunteersmentioning

confidence: 99%

Commissioning of a new wide-bore MRI scanner for radiotherapy planning of head and neck cancer

Liney

Owen²,

Beaumont³

et al. 2013

BJR

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Objective: A combination of CT and MRI is recommended for radiotherapy planning of head and neck cancers, and optimal spatial co-registration is achieved by imaging in the treatment position using the necessary immobilisation devices on both occasions, something which requires wide-bore scanners. Quality assurance experiments were carried out to commission a newly installed 1.5-T widebore MRI scanner and a dedicated, flexible six-channel phased array head and neck coil. Methods: Signal-to-noise ratio (SNR) and spatial signal uniformity were quantified using a homogeneous aqueous phantom, and geometric distortion was quantified using a phantom with water-filled fiducials in a grid pattern. Volunteer scans were also used to determine the in vivo image quality. Clinically relevant T 1 weighted and T 2 weighted fat-suppressed sequences were assessed in multiple scan planes (both sequences fast spin echo based). The performance of two online signal uniformity correction schemes, one utilising low-resolution reference scans and the other not utilising low-resolution reference scans, was compared. Results: Geometric distortions, for a 635-kHz bandwidth, were ,1 mm for locations within 10 cm of the isocentre rising to 1.8 mm at 18 cm away. SNR was above 50, and uniformity in the axial plane was 71% and 95% before and after uniformity correction, respectively. Conclusion: The combined performance of the wide-bore scanner and the dedicated coil was adjudged adequate, although superior-inferior spatial coverage was slightly limited in the lower neck. Advances in knowledge: These results will be of interest to the increasing number of oncology centres that are seeking to incorporate MRI into planning practice using dedicated equipment.

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Section: Materials and Methods/volunteersmentioning

confidence: 99%

Commissioning of a new wide-bore MRI scanner for radiotherapy planning of head and neck cancer

Liney

Owen²,

Beaumont³

et al. 2013

BJR

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“…In the present study, new DWT and image fusion based denoising techniques were proposed to [18] used the original image as the input image for image infusion in CT and MRI images in order to measure the location and enlargement of a brain tumor. Angoth, et al [19] used the original image as the input image to detect the size and position of a brain tumor in CT and MRI images.…”

Section: Discussionmentioning

confidence: 99%

Speckle noise reduction in ultrasound images using a discrete wavelet transform-based image fusion technique

Choi

Lee

Kim

et al. 2015

BME

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Abstract. Here, the speckle noise in ultrasonic images is removed using an image fusion-based denoising method. To optimize the denoising performance, each discrete wavelet transform (DWT) and filtering technique was analyzed and compared. In addition, the performances were compared in order to derive the optimal input conditions. To evaluate the speckle noise removal performance, an image fusion algorithm was applied to the ultrasound images, and comparatively analyzed with the original image without the algorithm. As a result, applying DWT and filtering techniques caused information loss and noise characteristics, and did not represent the most significant noise reduction performance. Conversely, an image fusion method applying SRAD-original conditions preserved the key information in the original image, and the speckle noise was removed. Based on such characteristics, the input conditions of SRAD-original had the best denoising performance with the ultrasound images. From this study, the best denoising technique proposed based on the results was confirmed to have a high potential for clinical application.

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“…The slices from CT scan sequence and MRI study sets are selected using anatomical and structural similarities with the help of radiologists. The interactive registration approach is used for registration process in this paper [18]. These registered source images are decomposed using RWT to extract edge-based features prominently.…”

Section: Proposed Systemmentioning

confidence: 99%

Multimodality Medical Image Fusion using Rotated Wavelet Transform

Chavan¹,

Pawar²,

Talbar³

2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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This paper presents a novel approach to multimodality medical image fusion for better visualization of lesions and calcification. The algorithm utilizes source modalities as Computed Tomography (CT) and Magnetic Resonance Imaging (MRI). It is a feature based fusion technique in which Rotated Wavelet Transform (RWT) is used for extraction of edge-related features from both the source modalities. These features are used to create new frequency domain plane using maxima and entropy based fusion rules. The fusion process is useful in the analysis of the lesions for diagnosis, treatment, and post treatment reviews. The proposed technique is evaluated on the pilot study sets using objective analysis parameters like entropy, root means square error, edge quality measure, mean structural similarity index measure, etc. The fusion results of the proposed technique are compared with the existing fusion algorithms. The subjective analysis of the fused images by radiologists reveals that the fused images using RWT technique are superior and present all relevant anatomical structures.

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A comparative study of three CT and MRI registration algorithms in nasopharyngeal carcinoma

Cited by 29 publications

References 23 publications

Commissioning of a new wide-bore MRI scanner for radiotherapy planning of head and neck cancer

Commissioning of a new wide-bore MRI scanner for radiotherapy planning of head and neck cancer

Speckle noise reduction in ultrasound images using a discrete wavelet transform-based image fusion technique

Multimodality Medical Image Fusion using Rotated Wavelet Transform

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