Sheet1IPSolution - Tanta university Faculty of engineering Computer and automatic control department Image processing course Fourth year students Sheet

Sheet1IPSolution - Tanta university Faculty of engineering...

This preview shows page 1 - 2 out of 5 pages.

Tanta university Faculty of engineering Computer and automatic control department Image processing course Fourth year students Sheet 1, Date : 3/10/2011 ------------------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------------------------- Instructor: Dr. Hamed Hemeda Sheet 1 solution 1. a) Application examples for using electromagnetic waves in imaging include: body scans in medicine, optical character recognition, exploring the universe in astronomy, and product inspection in industry. Application examples for using acoustic waves in imaging include: Mineral and oil exploration geology and body scan using ultrasound waves in medicine. b) X-ray medical imaging (an example for imaging using electromagnetic waves): X-rays are generated using an X-ray tube, which is a vacuum tube with a cathode and anode. The cathode is heated causing free electrons to be released. These electrons flow in high speed to the positively charged anode. When the electrons strike a nucleus, energy is released in the form of X-ray. The energy (penetrating power) of X-ray is controlled by the voltage applied across the anode, and by the current applied to the filament in the cathode. The patient is placed between the X-ray source and a film sensitive to X-ray energy. The intensity of the X-rays is modified by the absorption as they pass through the patient. This modification develops the image of the patient body on the film. Mineral and oil exploration (an example for imaging using acoustic waves): A large truck and a large flat steel plate are used to generate the acoustic energy. The plate is pressed on the ground by the truck, and the truck is vibrated through a frequency spectrum up to 100 Hz. The strength and the speed of the returned sound waves are determined by the composition of the earth below the surface. These are analyzed by computer, and images are generated from the resulting analysis. 2. This is an ultrasound image used in obstetrics. It’s produced as follows: a) The ultrasound system (a computer, ultrasound probe consisting of a source and receiver, and a display) transmits high-frequency (1 to 5 MHz) sound pulses into the body. b) The sound waves travel into the body and hit a boundary between tissues (e.g., between fluid and soft tissue, soft tissue and bone). Some of the sound waves are reflected back to the probe, while some travel on further until they reach another boundary and get reflected. c) The reflected waves are picked up by the probe and relayed to the computer. d) The machine calculates the distance from the probe to the tissue or organ boundaries using the speed of sound in tissue (1540 m/s) and the time of the each echo's return.
Image of page 1
Image of page 2

You've reached the end of your free preview.

Want to read all 5 pages?

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes