Metal Artifact Reduction in Cone-Beam Computed Tomography for Head and Neck Radiotherapy

Korpics, Mark; Johnson, Paul C.; Patel, Rakesh; Sürücü, Murat; Choi, Mehee; Emami, Bahman; Roeske, John C.

doi:10.1177/1533034615618319

Cited by 5 publications

(1 citation statement)

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“…Artifacts in planning CT and CBCT images may lessen treatment accuracy and potentially cause severe side effects for the patient [ 3 ]. Especially in CBCT images, metal artifacts produced by metal implants inside a patient may cause inaccuracy in CT numbers and the poor visualization of tumors and internal organs [ 4 ]. CT number inaccuracy is a critical problem if the CBCT image is used to calculate the dose of the treatment day.…”

Section: Introductionmentioning

confidence: 99%

Metal artifact reduction by filter-based dual-energy cone-beam computed tomography on a bench-top micro-CBCT system: concept and demonstration

Iramina

Hamaguchi

Nakamura

et al. 2018

Journal of Radiation Research

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We evaluated two dual-energy cone-beam computed tomography (DE-CBCT) methodologies for a bench-top micro-CBCT system to reduce metal artifacts on reconstructed images. Two filter-based DE-CBCT methodologies were tested: (i) alternative spectral switching and (ii) simultaneous beam splitting. We employed filters of 0.6-mm-thick tin and 0.1-mm-thick tungsten to generate high- and low-energy spectra from 120 kVp X-rays, respectively. The spectral switching method was imitated by two half scans with different filters (pseudo-switching). Filters were placed and between the X-ray tube and a phantom (‘1-u,’ ‘2-u’), a phantom and a flat panel detector (‘1-d,’ ‘2-d’), and compared with (iii) two half scans at 80 and 140 kVp [pseudo-(80,140)]. For the splitting method, two half-width filters were aligned along a rotating axis. Projections were separated into halves and merged with corresponding areas of opposed projections after one full rotation. A solid 30-mm-diameter acrylic phantom and an acrylic phantom with four 5-mm-diameter titanium rods were used. DE images were generated by weighted summation of the high- and low-energy images. The blending factor was changed from 0 to +5 in increments of 0.01. Relative errors (REs) of the linear attenuation coefficients of the two phantoms and the contrast-to-noise ratios (CNRs) between the titanium and acrylic regions were compared. All methods showed zero REs except for the method (2-d). CNRs for pseudo-switching with upstream placement were 1.4-fold larger than CNRs for the pseudo-(80,140) method. CNRs for the downstream placements were small. It was concluded that the pseudo-switching method with upstream placement is appropriate for reducing metal artifacts.

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Section: Introductionmentioning

confidence: 99%