Bowtie filter,as a beam shaping attenuator placed between X-ray source and scanned object in computed tomography system,can effectively reduce radiation dose.In addition,the bowtie filter is expected to be able to compress the dynamic range which could limit the application of some detectors.In ...
As one of the key hardware components in Computed Tomography (CT) scanners, a bowtie filter reduces unnecessary radiation dose to the peripheries of a patient and equalizes radiation signal to the detector. Knowledge of the exact profiles from different bowtie filters are critical to model the ...
They also typically use bowtie filters, which provide a higher dose towards the center of the field of view compared with the periphery. There is a tradeoff between noise and resolution, so noise can also be reduced by increasing the slice thickness, using a softer reconstruction kernel (soft...
Objective To evaluate the improvement of cone beam CT (CBCT) image quality by using bewtie filter (F_1) and water calibration. Methods First the multi-level gain calibration of the detector panel with the method of Cal_2 calibration was performed, and the CT images of CATPHAN503 with F_0...
CT<1% CTimageartifactCT图像伪影 Appearance伪影表现形式 Typesofartifact伪影类型 •Artifactsrelatedtosystemdesign;与系统物理特性相关伪影•Artifactsrelatedtoscannercomponents;与设备硬件相关的伪影•Patient-inducedartifacts;病人引起的伪影•Helicalandmulti-sliceartifact螺旋和多层面CT伪影；CTimageartifactCT图像伪...
Computed tomography Artifacts and distortion Reconstruction computerised tomography image reconstruction iterative methods medical image processing motion compensation computed tomography helical CT dose reduction beam‐shaper bowtie filter Medical image noise Computed tomography Image reconstruction Medical imaging Part...
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SU‐FF‐I‐24: The Influence of Bowtie Filtration On Cone‐Beam CT Image Quality Purpose: The large variation of x‐ray fluence at the detector across the imaged field‐of‐view in cone‐beam CT causes the loss of skin‐line and reduces... N Mail,D Moseley,J Siewerdsen,... - 《Me...
<1% CTimageartifactCT图像伪影 CTimageartifactCT图像伪影 •Definition概述•Causes,appearancesandcorrections原因、表现和 矫正方法 –Artifactsrelatedtosystemdesign;–Artifactsrelatedtoscannercomponents;–Patient-inducedartifacts;–Helicalandmulti-sliceartifact；•Video;•Mini-testing LearningObjectives教学目的 ...
only retain sequences with at least 90% base pair with quality score >20. Remained sequences were aligned to the unmasked human reference genome (GRGH37, hg19) using Bowtie Version 262with only one mismatch allowed. MACS Version 2 (Model-based Analysis for ChIP-Seq)43was used for the iden...