Hyun Joo Shin1, Myung-Joon Kim2, Choon-Sik Yoon3, Kwanseop Lee4, Kwan Sik Lee5, Jong-Chul Park6, Mi-Jung Lee7, Haesung Yoon8. 1. Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea. lamer-22@yuhs.ac. 2. Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea. mjkim@yuhs.ac. 3. Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. yooncs58@yuhs.ac. 4. Department of Diagnostic Radiology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea. kwanseop@hallym.or.kr. 5. Department of Gastroenterology and Hepatology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. leeks519@yuhs.ac. 6. Cellbiocontrol Laboratory, Department of Medical Engineering, Yonsei University College of Medicine, Seoul, Korea. parkjc@yuhs.ac. 7. Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea. mjl1213@yuhs.ac. 8. Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea. saydivine@yuhs.ac.
Abstract
AIMS: To evaluate the differences between shear wave velocities (SWVs) measured with ultrasound elastography during the continuous motion using liver fibrosis phantoms. MATERIALS AND METHODS: Elasticities were measured with convex and linear transducers of supersonic shear wave imaging (SSI) and acoustic radiation force impulse imaging (ARFI) using liver elasticity phantoms (3.0 and 16.9 kPa) at depths of 2, 3, 4, and 5 cm. Motion velocities were 30 and 60 rpm with the phantoms in an upright position on the Orbital shaker. To simulate different directional motion, the phantoms were laid on their side on the shaker. The values between moving and static status were compared, and the number of measurement failure was counted. Results: In SSI, the convex transducer was less affected by motion at 30 rpm with the 3 kPa phantom. In the higher velocity motion and in the higher stiffness phantom, most values from SSI were different comparing with static status, and there was a tendency for elasticity values to increase during movement. In ARFI, there were frequent measurement failures without stable results during the motion. CONCLUSIONS: Motion affected the measurement of elasticity differently in SSI and ARFI, according to the velocity, direction of the motion, and phantom stiffness. The convex transducer of SSI was less affected by motion in lower velocity motion and when using normal liver stiffness phantom.
AIMS: To evaluate the differences between shear wave velocities (SWVs) measured with ultrasound elastography during the continuous motion using liver fibrosis phantoms. MATERIALS AND METHODS: Elasticities were measured with convex and linear transducers of supersonic shear wave imaging (SSI) and acoustic radiation force impulse imaging (ARFI) using liver elasticity phantoms (3.0 and 16.9 kPa) at depths of 2, 3, 4, and 5 cm. Motion velocities were 30 and 60 rpm with the phantoms in an upright position on the Orbital shaker. To simulate different directional motion, the phantoms were laid on their side on the shaker. The values between moving and static status were compared, and the number of measurement failure was counted. Results: In SSI, the convex transducer was less affected by motion at 30 rpm with the 3 kPa phantom. In the higher velocity motion and in the higher stiffness phantom, most values from SSI were different comparing with static status, and there was a tendency for elasticity values to increase during movement. In ARFI, there were frequent measurement failures without stable results during the motion. CONCLUSIONS: Motion affected the measurement of elasticity differently in SSI and ARFI, according to the velocity, direction of the motion, and phantom stiffness. The convex transducer of SSI was less affected by motion in lower velocity motion and when using normal liver stiffness phantom.
Authors: Guillermo Carbonell; Juan de Dios Berná-Serna; Lidia Oltra; Carlos M Martínez; Nuria Garcia-Carrillo; Florentina Guzmán-Aroca; Francisco Javier Salazar; José Tudela; Juan de Dios Berná-Mestre Journal: PLoS One Date: 2019-05-23 Impact factor: 3.240
Authors: Jee Hyeon Lee; Sang Min Lee; Jeong Hee Yoon; Min-Jeong Kim; Hong Il Ha; Sung-Joon Park; Eun Soo Kim; Kwanseop Lee; Jeong Min Lee Journal: Ultrasonography Date: 2020-04-12