The usefulness of SwiftScan technology for bone scintigraphy using a novel anthropomorphic phantom

Abstract

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%.

Optimization of 99mTc whole‐body SPECT/CT image quality: A phantom study

“…The noise characteristics, contrast, and CNR were evaluated for each acquisition time using statistics obtained from ROIs in both normal and abnormal areas in bone. 26 , 29 , 30 ROIs were drawn on the hot abnormal bone area identified by the reporting physician. Additional ROIs were delineated over areas of adjacent normal bone guided by the CT boundaries of the fused SPECT/CT images.…”

Improvement of Quantitative Single-Photon Emission Computed Tomography Image Quality by the New Step-and-Shoot Scan Mode

“…A previous study assessed the usefulness of the Swiftscan SPECT in bone scintigraphy. Swiftscan SPECT has been reported to reduce image noise and improve CNR compared with the SS mode [4]. However, the…”

“…A previous study assessed the usefulness of the Swiftscan SPECT in bone scintigraphy. Swiftscan SPECT has been reported to reduce image noise and improve CNR compared with the SS mode [4]. However, the study was performed only with ACSCRR, and there is no study on the effect of the SSC mode on the image quality by combining other correction methods for SPECT images.…”

“…It is expected to reduce scan time and the injected dose because increasing projection counts improves sensitivity. Although physical image quality has been evaluated by phantom studies using Swiftscan SPECT and SS mode [3,4], the effects of the scan time and various image correction methods have not been fully investigated.…”

Verification of Effect of Acquisition Time for SwiftScan on Quantitative Bone Single-Photon Emission Computed Tomography Using an Anthropomorphic Phantom

“…Acquisition methods, such as the step and shoot mode (SSM) and continuous mode (CM) [14], are commonly used for SPECT. SwiftScan (GE Healthcare, Milwaukee, WI, USA) [15][16][17][18] SPECT is a recently developed scanning technique with data acquisition during detector static and rotation. Thibault et al [17] reported that the GE-developed SwiftScan with low-energy high-resolution and sensitivity (LEHRS) collimator improved sensitivity compared to that of low-energy high-resolution (LEHR) collimator.…”