| Autor: |
Shibutani T; Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan., Onoguchi M; Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan. onoguchi@staff.kanazawa-u.ac.jp., Naoi Y; Clinical Imaging Center for Healthcare, Nippon Medical School, Tokyo, Japan., Yoneyama H; Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan., Konishi T; Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan., Tatami R; Department of Radiological Technology, Ishikawa Prefectural Central Hospital, Kanazawa, Japan., Nakajima K; Department of Functional Imaging and Artificial Intelligence, Kanazawa University, Kanazawa, Japan. |
| Abstrakt: |
The aim of this study was to demonstrate the usefulness of SwiftScan with a low-energy high-resolution and sensitivity (LEHRS) collimator for bone scintigraphy using a novel bone phantom simulating the human body. SwiftScan planar image of lateral view was acquired in clinical condition; thereafter, each planar image of different blend ratio (0-80%) of Crality 2D processing were created. SwiftScan planar images with reduced acquisition time by 25-75% were created by Poisson's resampling processing. SwiftScan single photon emission computed tomography (SPECT) was acquired with step-and-shoot and continuous mode, and SPECT images were reconstructed using a three-dimensional ordered subset expectation maximization incorporating attenuation, scatter and spatial resolution corrections. SwiftScan planar image showed a high contrast to noise ratio (CNR) and low percent of the coefficient of variance (%CV) compared with conventional planar image. The CNR of the tumor parts in SwiftScan SPECT was higher than that of the conventional SPECT image of step and shoot acquisition, while the %CV showed the lowest value in all systems. In conclusion, SwiftScan planar and SPECT images were able to reduce the image noise compared with planar and SPECT image with a low-energy high-resolution collimator, so that SwiftScan planar and SPECT images could be obtained a high CNR. Furthermore, the SwiftScan planar image was able to reduce the acquisition time by 25% when the blend ratio of Clarity 2D processing set to more than 40%. |
