Category Archives: LECTURE NOTES

Lecture Notes On Fiber Optics & Laser in Medicine for Biomedical Engineers

Fibre optic strands

optical fibers

These lecture notes will provide an insight to the Biomedical Engineer interested in this field
They are good for beginners but still better for revision as well.

Lecture-1

Fiber Fabrication:

Two basic techniques in fabrication of all glass optical waveguides.

Vapor-phase oxidation process

– Direct melt methods

Lecture 2

Fiber properties & losses

Lecture-3

Introduction to laser

lecture 4

COMPLETE LECTURE NOTES ON BASICS OF MICROELECTROMECHANICAL SYSTEMS(MEMS)

DOWNLOAD ALL THE MEMS LECTURE NOTES FROM THE LINKS GIVEN BELOW
THESE LECTURE NOTES CONTAIN COMPLETE INFORMATION ABOUT MEMS.

Introduction: history of MEMS, market for MEMS, overview of MEMS processes, properties of silicon, a sample MEMS process.
Handouts: class syllabus, silicon crystal origami, Petersen’s, Feynman’s.
Lecture Notes: Lecture 1.
Basics of Microtechnology: definitions and terminology, a sample process, lithography and etching.

References:There’s Plenty of Room at the Bottom” by Richard Feynman (reprinted in Journal of Microelectromechanical Systems, March 1992); “Silicon as a Mechanical Material” by Kurt Petersen (Proceedings of the IEEE, May 1982).
Lecture Notes: Lecture 2.

LECTURE NOTES ON MEDICAL IMAGE PROCESSING ALGORITHMS

Lecture Notes-CLICK ON THE TOPICS TO DOWNLOAD THEM DIRECTLY

  • Topic 2. Overview of different image modalities: photo images, video, and 2D-3D-4D medical data
  • Topic 3. Overview of basic image processing (point and local neighborhood processing): gamma correction, histogram equalization, window-center adjustment, linear filtering, image gradients.
  • Topic 4. Basic image segmentation in 2D (thresholding, region-growing, mean-shift, live-wire).
  • Topic 5. Deformable models (snakes): gradient descend, DP-snakes. Also distance transforms and generalized distance transforms.
  • Topic 6. Beyond snakes: implicit vs. explicit representation of boundaries, level-sets, geodesic active contours, geometric energy functionals.

LECTURE NOTES ON BASICS OF DIGITAL IMAGE PROCESSING

Lecture 1: [DOWNLOAD AS PDF]
Outline:

Image Formation
Inside the Camera – Projection
Inside the Camera – Sensitivity
Sensitivity and Color
Summary
Digital Image Formation
Sampling
Quantization
Summary
(R,G,B) Parameterization of Full Color Images
Grayscale Images
Images as Matrices
Homework I 


Lecture 2: [DOWNLOAD AS PDF]
Outline:

Summary of Lecture 1
Simple Processing – Transpose
Simple Processing – Flip Vertical
Simple Processing – Cropping
Simple Image Statistics –  Sample Mean and Sample Variance
Simple Image Statistics – Histogram
Point Processing
Summary
Homework Rules
Homework II 


Lecture 3: [DOWNLOAD AS PDF]
Outline:

Summary of Lecture 2
Brief Note on Image Segmentation
Histogram Based Image Segmentation
Histogram Equalization
Summary
 

VIDEO LECTURE NOTES ON MEDICAL IMAGING MODALITIES

1. X-ray imaging (Running time: 9min 55s.)

  • Introduction and explanation of x-ray imaging using the analogy of the shadow cast by a net curtain in sunlight. Includes a series of x-ray pictures of: dislocated finger; fractured tibia and fibula; tibia repaired using a metal rod; lungs; lumbar spine; hairline fracture to the skull; skull complete with hearing aid (which the patient forgot to take off!!)
  • Demonstration of a standard x-ray set including x-ray tube, aperture, film cassette and intensifying screens. Description includes two series of graphics: the first showing the detailed construction of an x-ray tube in its housing; the second, explaining how intensifying screens work.
  • A barium meal examination being performed.
  • Mammography being performed. Includes x-ray pictures of a breast with a tumour and one without (for comparison).
  • Demonstration of a CT scanner. Includes a brief interview with a radiographer who interprets a set of brain scans which reveal a brain tumour.

2. Radiotherapy (Running time: 5min 9s.)

  • Interview with a medical physicist who explains how radiotherapy treatments were planned for two case studies: cancer of the prostate and cancer of the breast.
  • Demonstration of a cobalt 60 machine showing the aperture and wedges (used to shape the gamma ray field). Also shows the layout of the treatment suite (concrete walls a metre thick etc).
  • Demonstration of a linear accelerator.

3. Ultrasound (Running time 9min 52s.)

  • Introduction to ultrasound imaging by way of sonar aboard trawlers.
  • Ultrasound examination of a pregnant woman. The doctor locates and talks about the baby’s heart, head, foot (it obligingly waggles its toes at the camera!), and spine.
  • Ultrasound examination of the abdomen of a man. The doctor locates and talks about his gall bladder, liver and kidney. He shows how the machine is used to measure structures e.g. the length of the kidney.
  • Close-up of the ultrasound probe, with a series of graphics to explain how it works.
  • Introduction to Doppler ultrasound using the analogy of the change of pitch of the noise from a train as it passes. Includes simple graphic.
  • Demonstration of Doppler ultrasound being used to “listen” to the blood flow in the presenter’s arm.
  • Doppler ultrasound examination of the leg of a man with severe vascular disease. You can hear how blocked up his arteries are!
  • Demonstration by a clinician of how ultrasound imaging and Doppler ultrasound are used together to measure and create images of blood flow.

4. Nuclear medicine (Running time 7min 32s.)

  • Introduction, including delivery to the hospital radiopharmacy of molybdenum 99 from Canada.
  • Demonstration by a radiopharmacist of how drugs are labelled with technetium 99m (derived from molybdenum 99). In particular, he shows how fluid is drawn from a technetium generator.
  • Demonstration of how a gamma camera is used to image the head. Presenter shows and describes the lead collimator, sodium iodide crystal and photomultiplier tubes. Includes a graphic.
  • Interpretation of several gamma camera images: a brain scan (normal); kidney scan (shows that one ureter is blocked); bone scans (one showing a kidney tumour which has spread to the spine; the other, confirming no secondary tumours in a young man part of whose femur had been removed due to bone cancer).

5. Magnetic Resonance Imaging (Running time 4min 31s.)

  • Introduction, including the shattering of a tulip embrittled by immersion in liquid nitrogen and brief description of superconductivity.
  • Demonstration of Magnetic Resonance Imaging scanner.
  • Demonstration of how the MRI coil is made in the factory.
  • Demonstration of how strong the magnetic field is by showing how a set of keys suspended on a wire are drawn towards the coil.
  • Sequence of MRI images of a set of slices through a head, revealing detailed structure of brain, eyes etc.
  • Demonstration of advanced techniques to show: firstly, a heart beating and; secondly, rotation of a 3D image of the blood supply to the head.
  • Description of the latest compact MRI machine which enables heads, arms and legs to be examined more cheaply.

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