Featured Research

from universities, journals, and other organizations

Diagnostic imaging: New chip provides better all-round performance

Date:
December 4, 2013
Source:
The Agency for Science, Technology and Research (A*STAR)
Summary:
A new microelectromechanical system provides the 360-degree view that is critical in diagnostic imaging.

A polygon-shaped pyramidal reflector on a silicon microelectromechanical system (MEMS) chip that allows full circumferential diagnostic imaging.
Credit: 2013 A*STAR Institute of Microelectronics

Small optical devices are important for diagnostic imaging in the body; they serve, for example, as optical probes in blood vessels or the gastrointestinal tract. For accurate diagnosis, such applications require a 360-degree view of their environment.

A microelectromechanical silicon chip developed by researchers from the A*STAR Institute of Microelectronics, Singapore, in collaboration with colleagues from the National University of Singapore, offers a feasible solution for in vivo diagnostics. The chip can rotate scanning laser beams by almost a full turn at high speed.

Scientists are widely investigating the microelectromechanical systems (MEMS) used by the researchers in Singapore, with the aim of adding complex functionality to optical or mechanical applications. Typically, these systems are complex structures, such as movable parts or mirrors that are edged into a silicon chip. Their small size makes MEMS devices ideal for circumferential diagnostic imaging systems. The small scanning angles, however, limited earlier attempts to fabricate such devices. The difficulty arose from the inability to fully utilize standard MEMS-based actuators and their linear movements for rotational devices.

The important advance in the device's design is the implementation of a new reflector for the scanning laser, notes Xiaojing Mu from the research team. "We have designed a pyramidal polygon reflector as the key component to realize full circumferential scanning," says Mu. "The reflector is placed on a sophisticated structure that translates the linear movement of the electrostatic actuators into the large rotational motion of the reflector."

In the new design, the pyramidal reflector (see image) is mounted on a small ring. Four electrostatic actuators on the side of the device rotate this ring by about 40 degrees, which, combined with the eight facets of the pyramid, means that an almost full circumferential area is covered by a laser illuminating the pyramid. Because the actuators only use electrical fields to create movement via electrostatic repulsion, almost no electrical current is used. As such, the device consumes very little power and generates no heat, which makes it compatible for medical applications inside the body.

Although the present design represents a strong demonstration of the operating principle, further improvements will be needed, according to Mu. "Unfortunately, so far, the pyramidal polygon cannot be fabricated by the traditional MEMS semiconductor process. Thus, we are seeking alternative production strategies." Nevertheless, with the help of MEMS or even smaller devices on the nanoscale, there is increasing potential for realizing more sophisticated medical diagnostics for use in the human body.

The A*STAR-affiliated researchers contributing to this research are from the Institute of Microelectronics.


Story Source:

The above story is based on materials provided by The Agency for Science, Technology and Research (A*STAR). Note: Materials may be edited for content and length.


Journal Reference:

  1. Xiaojing Mu, Guangya Zhou, Hongbin Yu, Julius Ming-Lin Tsai, Wee Keong Neo, A. Senthil Kumar, Fook Siong Chau. Electrostatic Micromachined Resonating Micro-Scanner for Circumferential Endoscopic Bio-Imaging. IEEE Photonics Technology Letters, 2013; 25 (8): 749 DOI: 10.1109/LPT.2013.2249057

Cite This Page:

The Agency for Science, Technology and Research (A*STAR). "Diagnostic imaging: New chip provides better all-round performance." ScienceDaily. ScienceDaily, 4 December 2013. <www.sciencedaily.com/releases/2013/12/131204090758.htm>.
The Agency for Science, Technology and Research (A*STAR). (2013, December 4). Diagnostic imaging: New chip provides better all-round performance. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2013/12/131204090758.htm
The Agency for Science, Technology and Research (A*STAR). "Diagnostic imaging: New chip provides better all-round performance." ScienceDaily. www.sciencedaily.com/releases/2013/12/131204090758.htm (accessed July 31, 2014).

Share This




More Health & Medicine News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Xtreme Eating: Your Daily Caloric Intake All On One Plate

Xtreme Eating: Your Daily Caloric Intake All On One Plate

Newsy (July 30, 2014) The Center for Science in the Public Interest released its 2014 list of single meals with whopping calorie counts. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile: iPhone Android Web
      Follow: Facebook Twitter Google+
      Subscribe: RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins