Influence of Cortical Endplates on Ultrasonic Properties of Trabecular Bone

Abstract

주요용어: 골다공증, 해면질골, 피질골판, 겉보기 골밀도, 정량적 초음파, 음속, 감쇠계수Abstract The present study investigated the influence of thick cortical endplates on the ultrasonic properties of trabecular bone in a femur with a high fracture risk. Twelve trabecular bone samples were prepared from bovine femurs, and acrylic plates with thicknesses of 1.25, 1.80, and 2.75 mm were manufactured to simulate the cortical endplates using acrylic with a density and a sound speed similar to cortical bone. Although the thickness of the acrylic plates attached to the two sides of the trabecular bone increased, high correlations were observed between the speed of sound and the apparent bone density of the trabecular bone, with Pearson's correlation coefficients of 0.80-0.86. High correlations were also observed between the attenuation coefficient at 0.5 MHz and the apparent bone density of the trabecular bone, with Pearson's correlation coefficients of 0.84-0.91. These results suggest that the speed of sound and attenuation coefficient at a specific frequency measured in a femur with relatively thick cortical endplates compared to the calcaneus could be used as indices for predicting the bone mineral density of the femur.

Prognosis methods of stress corrosion cracking under harsh environmental conditions

“…It works by sending short bursts of ultrasonic high-frequency waves into a material using a transducer that acts as both the transmitter and receiver, and when the waves encounter a defect, a change is noted in the wave, and it is then reflected to the same transducer, which will now act as a receiver [ [59] , [60] , [61] , [62] ]. This method can be performed in different modes such as the contact testing methodology [ 63 ], in which the material is directly in contact with the transducer, and immersion testing [ 64 ], in which the material or test object is submerged in a water tank to facilitate the ultrasonic tests. This method can be applied to materials that are both under atmospheric and submerged harsh corrosive conditions, which allow for remote and continuous material testing to detect SCC material defects [ 65 ].…”