In ultrasound, low-frequency sound waves directed through the skin produce echoe
ID: 123007 • Letter: I
Question
In ultrasound, low-frequency sound waves directed through the skin produce echoes that are converted by computer into an image on a screen. 4-D ultrasound provides live-action images for observation of fetal movement. Radiation therapy is used to treat cancer by promoting cellular reproduction. A roentgen ray is another name for an X-ray. Hysterosalpingography is a radiological exam of a vagina. In the space provided, write the letter of the choice that best completes each statement or answers each question. An X-ray is a type of electromagnetic wave that has a a. Low energy level and an extremely long wavelength b. Low energy level and an extremely short wavelength c. High energy level and an extremely short wavelength d. High energy level and an extremely long wavelength e. Low energy level and a variable wavelength 2. A test that utilizes a contrast medium and fluoroscopy to help diagnose abnormalities or injuries in the cartilage, tendons, or ligaments of the joints is called a. Arthrography b. Cholangiography c. Thermography d. Angiography e. TomographyExplanation / Answer
21. False. Ultrasound waves have frequencies higher than the upper audible limit of human hearing. Ultrasound devices operate with 20 kHz up to several gigahertz of frequencies.
22. True. 4-D ultrasound produces live action images for observation of fetal movements, while these energy waves are unlikely to cause damage, but these energy waves should be used in limited amount.
23. False. Radiation therapy in the treatment of cancer uses high-energy particles or waves, such as x-rays, gamma rays, electron beams, or protons, to destroy or damage cancer cells.
24. True. Wilhelm Conrad Röntgen, a German mechanical engineer and physicist in 1895, produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgenrays, for which he got the Nobel Prize.
25. True. Hysterosalpingography, also known as uterosalpingography, is an x-ray examination of a woman's uterus and fallopian tubes that uses fluoroscopy and a contrast material for the diagnosis and treatment of several medical conditions.
Multiple choice
1. X-rays have much shorter wavelengths and higher frequencies. Only gamma rays carry more energy. X-rays have energies ranging from less than 1 keV to greater than 100 keV.
2. Arthrography is medical imaging to evaluate abnormalities or injuries in the cartilage, tendons or ligaments of joints. It can either be direct or indirect. Indirect arthrography is a medical imaging technique in which contrast material is injected into the blood stream and eventually absorbs into the joint.
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