An ultrasonic method for 3D reconstruction of surface topography

Abstract

This study uses an acoustic technique to determine the surface topography for three target objects. Ultrasound is used to define the 3D surface of a wrench, the face of a British twenty-pence coin (20p) that features the profile of Queen Elizabeth II and a US five-cent coin. A single transducer is used to automatically scan the target region, in order to produce a matrix of the point-to-point reflected amplitude data. This work not only showed the surface topography of the targets as a 3D image but also scaled up the height of the particular local surface, which proves that the signal processing method can be applied to make special display treatment for the local area of interest. The experimental process and results perform an attempt method for 3D image reconstruction. Spatial resolution is important for the production of 3D images. For the three experiments, the transducer moves in 0.1 mm steps, which give tens of thousands of scanned data points within the given region. The scale of the surface topography is adjusted by recalibrating the reflected signals. The maps show the reflection coefficient for the two kinds of coins, varied from 0.74 to 0.99.

Millimeter wave‐based patient setup verification and motion tracking during radiotherapy

“…One or more mmWave devices can be used to acquire data for surface reconstruction, similar to the way that ultrasounds reconstruct surface topography from reflected signals. 15 The current mmWave device does face some limitations and challenges. The mmWave radar measures a relatively large spot size, which can be the reason that mmWave measurement is different from CBCT SSD measurement at some angles in our study.…”

“…Finally, the mmWave device can also perform imaging as a future use case. One or more mmWave devices can be used to acquire data for surface reconstruction, similar to the way that ultrasounds reconstruct surface topography from reflected signals 15 …”

Three Dimension Scanning using Infrared Coded Light

“…However, ToF sensor is expensive in price and in order to obtain a densely 3D point cloud, additional components such as motors are needed which increase the size of the scanner [9]. Parallel ultrasonic beam emitted from the transmitting transducer has relatively poor resolution and need to be manually focus by lens [11].…”

3D Scanner Using Infrared for Small Object

“…Besides laser and camera, there are various way that used for distances measurement tools in 3D scanning: infrared [18]- [21], ultrasonic sensor [22]- [26], scanning from heating methods [27] are various ways using imaging and sensors methods [19], [28]- [31] for 3D image reconstruction.…”