Because breast tissue changes shape as the ultrasound scanner moves over it, researchers say locating the tumor can be a challenge.
由于胸部的组织会在受到超声波扫描仪照射时改变形状，所以研究人员认为定位肿瘤的位置会是一项挑战。
Ultrasound scanner
原声例句
VOA Daily Standard 2018年8月合集
中文百科
医学超声检查 Medical ultrasound
（重定向自Ultrasound scanner）
医学超声检查（超声检查、超声诊断学）是一种基于超声波（超音波）的医学影像学诊断技术，使肌肉和内脏器官——包括其大小、结构和病理学病灶——可视化。产科超声检查在妊娠时的产前诊断广泛使用。
超声频率的选择是对影像的空间分辨率和患者探查深度的折中。典型的诊断超声扫描操作采用的频率范围为2至13兆赫。
虽然物理学上使用的名词“超声”用于指所有频率在人耳听阈上限(20,000赫兹)以上，但在医学影像学中通常指频带比其高百倍以上的声波。
英语百科
Medical ultrasound 医学超声检查
（重定向自Ultrasound scanner）
![Orthogonal planes of a 3 dimensional sonographic volume with transverse and coronal measurements for estimating fetal cranial volume.[1][2]](/uploads/202502/18/Head-3D1026.jpg)
Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints, vessels and internal organs. Its aim is often to find a source of a disease or to exclude any pathology. The practice of examining pregnant women using ultrasound is called obstetric ultrasound, and is widely used.