Topic
Imaging phantom
About: Imaging phantom is a research topic. Over the lifetime, 28170 publications have been published within this topic receiving 510003 citations. The topic is also known as: phantom.
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21 Oct 1995
TL;DR: Performance measurements of the General Electric Advance Positron Emission Tomograph operating with the septa retracted (3D mode) have been made and data collected included transaxial and axial resolution, uniformity, recovery coefficients, count rate performance, dead time accuracy, and effect of scatter correction.
Abstract: Performance measurements of the General Electric Advance Positron Emission Tomograph operating with the septa retracted (3D mode) have been made. All reconstructions were done with the GE Advance 3D package. Performance tests were carried out with: the NEMA phantoms; a 3D Hoffman phantom; a Data Spectrum torso phantom with lung and cardiac inserts; and the "Utah" 3D evaluation phantom. Data collected included: transaxial and axial resolution, uniformity, recovery coefficients, count rate performance, dead time accuracy, and effect of scatter correction.
147 citations
TL;DR: FLAIR delivers the most robust substrate for radiomic analyses and demonstrated excellent intraobserver and interobserver reproducibility (intraclass correlation coefficient ≥ 0.75); care must be taken in the interpretation of clinical studies using nonrobust features.
Abstract: ObjectivesThe aim of this study was to investigate the robustness and reproducibility of radiomic features in different magnetic resonance imaging sequences.Materials and MethodsA phantom was scanned on a clinical 3 T system using fluid-attenuated inversion recovery (FLAIR), T1-weighted (T1w), and T
147 citations
TL;DR: A similar image quality to the current single-slice MVCT scanner is achieved with the advantage of providing tens of tomographic slices for a single gantry rotation.
147 citations
TL;DR: A novel approach to motion correction based on dual gating and mass-preserving hyperelastic image registration is presented, which accounts for intensity modulations caused by the highly nonrigid cardiac motion.
Abstract: Respiratory and cardiac motion leads to image degradation in positron emission tomography (PET) studies of the human heart. In this paper we present a novel approach to motion correction based on dual gating and mass-preserving hyperelastic image registration. Thereby, we account for intensity modulations caused by the highly nonrigid cardiac motion. This leads to accurate and realistic motion estimates which are quantitatively validated on software phantom data and carried over to clinically relevant data using a hardware phantom. For patient data, the proposed method is first evaluated in a high statistic (20 min scans) dual gating study of 21 patients. It is shown that the proposed approach properly corrects PET images for dual-cardiac as well as respiratory-motion. In a second study the list mode data of the same patients is cropped to a scan time reasonable for clinical practice (3 min). This low statistic study not only shows the clinical applicability of our method but also demonstrates its robustness against noise obtained by hyperelastic regularization.
146 citations
TL;DR: In this paper, two novel preprocessing techniques are applied to reinforce the detection performance and image quality in microwave imaging systems designed for brain stroke detection, which are validated on a realistic head phantom that is fabricated to emulate the electrical properties of real human head.
Abstract: Two novel preprocessing techniques are applied to reinforce the detection performance and the image quality in microwave imaging systems designed for brain stroke detection. The image of energy distribution is obtained by applying a delay-and-sum beamforming to the backscattered signals measured using a hemielliptical array of 16 corrugated tapered slot antenna elements surrounding the head. The beamformer forms a spatially filtered combination of time-delayed response of scattering points in the head exposed to microwave radiation over the band from 1 to 4 GHz. The proposed techniques are validated on a realistic head phantom that is fabricated to emulate the electrical properties of real human head. The results show how the proposed techniques enable the detection and localization of hemorrhagic stroke accurately.
146 citations