Objectives

Micro and Nano CT scanning device creates 2D slices of an object based on material density measured by X-ray transmission. Various type of samples of different attributes and structures ranging from geology, space technology, materials manufacturing, biomedical are analyzed in micro nano computed tomography. In domain of electronic components, micro devices, composites, porous metallic/ceramic, polymers and rubber components, biomedical samples, food, micro fossils are also analyzed. The visualization is generated for depth information of porosity analysis. The other parameters such as analysis microstructure, pore size distribution, fiber volume analysis and textured analysis are also done by using analyzing software. Besides these, the image reconstruction and analysis of exact size and shape of any 3D objects would be helpful via reverse engineering tool. Non-destructive imaging, FE analysis and development of implants and devices, automotive engine, mechanical device manufacturing can also be facilitated using these tool.

People

Prof. Santanu Dhara

Facilitator

Medical Science and Technology

sdhara@smst.iitkgp.ac.in

+91-3222-282306

Equipment Details

Utility and Working Principal

In micro CT (computed tomography) a micro-CT image is generated by rotating the sample in very small steps around a single axis of rotation while taking a series of 2D radiographs. The 3D image can reconstructed using reconstruction algorithms, such as filtered back projection algorithm, and saved as volume file. The voltage and current are also selected for x ray generation depending on the density of the material. After selection of following parameters detector calibration step is done to calibrate the detector. In order to do this step the sample is moved out from the line of X-ray focus.  After calibration the sample moves automatically to its original saved position. Once the sample moves to original position the scan starts.

The acquisition file is obtained and further processed for analysis purpose. The file is exported to analysis software for volume rendering. Surface determination is done by selecting the background and material in the 2D image. After calculating, 3D view of the sample is obtained.   To characterize the material and pores in the material, porosity analysis module is used. The pores are identified by respective color codes with percentage of volume.