RDT 102 MIDTERMS

• Deals with the development of problem specific approaches to enhance the raw medical

  data for the purpose of selective visualization as well as further analysis.

  BASIC IMAGE PROCESSING
• Plays an important role in assessing any new hardware, software, image acquisition

  techniques, image reconstruction or post-processing algorithms.

  Quality Evaluation
• A technique that not only removes unwanted artifacts from the medical image but also

  enhances the required portion.


  Pre-medical Image Processing
• Advanced post-processing describes the manipulation of radiographic images to derive

  additional data.

  Post-Medical Image Processing
• The 2D Fourier Projection Theorem in Radiography basically states that a 2D X-ray image

  contains all the information needed to reconstruct the 3D structure of an object.

  2D Fourier Projection Theorem
• The Algebraic Reconstruction Method in Radiography is a technique used to reconstruct

  images from CT Scan data by solving a system of equations based on the physical

  properties of the imaging process.

  Algebraic Reconstruction Method
• The Filtered Back-Projection method in radiography involves applying a filter to X-ray data

  and then reconstructing an image by back-projecting the filtered data onto a plane,

  allowing for the creation of detailed images from CT scans.

  Filtered Back-Projection Method
• Creating a three-dimensional representation of an object from a dataset acquired through

  radiographic imaging, allowing for visualization and analysis of the object from multiple

  angles and perspectives.

  3D
• • Analytic Approach

  • Iterative approach

  Trend in 3D reconstruction:
• In radiography, a histogram is a graphical representation of the distribution of pixel

  brightness values within an image.

  Histogram
• This can be helpful in analyzing the overall

  contrast and exposure of the image, as well as identifying any potential issues such as

  underexposure or overexposure. Radiographers often use histograms to evaluate and

  adjust imaging parameters to optimize image quality.

  Histogram
• In radiography, the Nyquist theorem states that to accurately capture and represent an

  analog X-ray signal digitally, the sampling rate must be at least twice the highest

  frequency present in the signal.

  Nyquist Theorem
• In simpler terms, aliasing in radiography occurs when the digital representation of the X-

  ray image doesn't accurately reflect the true appearance of the imaged object, especially in areas with high spatial frequency content.

  Aliasing
• aliasing, radiographers must

  ensure that the digital X-ray equipment operates at a sampling rate that meets or exceeds

  the Nyquist rate for the frequencies present in the X-ray signal.

  Aliasing