Improving soft-tissue contrast in four-dimensional computed tomography images of liver cancer patients using a deformable image registration method

International Journal of Radiation Oncology, Biology, Physics
He WangLei Dong

Abstract

To investigate a deformable image registration method to improve soft-tissue contrast in four-dimensional (4D) computed tomography (CT) images of the liver. Ten patients with hepatocellular carcinoma underwent 4D CT scan for radiotherapy treatment planning on a positron emission tomography/CT scanner. Four-dimensional CT images were binned into 10 equispaced phases. The exhale phase served as the reference phase, and images from the other nine phases were coregistered to the reference phase image using an intensity-based, automatic deformable image registration method. Then the coregistered images were combined to create a single, high-quality reconstructed CT image at exhale phase as the new reference for target delineation. The extent of image quality enhancement was quantified relative to the original CT by calculating the signal-to-noise ratio and the contrast-to-noise ratio. The soft tissue image contrast was noticeably better after deformable image registration than in the original scans. Signal-to-noise ratios inside the liver region of interest increased for all patients by a factor of 3.0 (range, 2.3-3.7). The improvement in image quality was not linearly proportionate to the number of images averaged. Using only 6 pha...Continue Reading

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Citations

May 29, 2009·Medical Physics·T N NguyenK K Brock
Aug 25, 2010·International Journal of Radiation Oncology, Biology, Physics·Michael VelecKristy K Brock
Oct 8, 2013·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Matthijs F KruisMarcel van Herk

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