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Free Radiology Tech Practice Test

Try this Free Radiology Tech Practice Test to see what’s on a licensing or certification exam for x-ray techs. In case you miss any questions, adequate explanations have been provided. We highly recommend you to take this test.

  1. 15 questions in all. There is no time constraint, so take your time. You need to score at least 70% to pass
  2. You can retake the test at any time. We recommend you share with friends too.
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#1. A patient comes in for a radiologic exam and requires an intravenous injection of contrast. What is the normal range for creatinine?


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This is the normal range for creatinine. Increasing your physical activities will help your creatinine levels.  Low creatinine is dangerous and harmful. Muscle and liver disease can lead to lower creatinine levels. Elevated levels can lead to more harmful effects. Symptoms include nausea, vomiting, and high blood pressure. Higher creatinine symptoms include kidney failure and dehydrations.

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#2. A patient is having a CAT scan of the head. After injecting contrast, the patient complains of nausea and having problems breathing. What type of shock is the patient experiencing?


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Anaphylaxis shock is a severe, potentially life-threatening allergic reaction. A patient can experience nausea, vomiting, low blood pressure, and trouble breathing. Anaphylaxis is treated with an injection of epinephrine.

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Septic shock is because of infections. Heart problems will lead to cardiogenic shock. Neurogenic shock is caused by damage to your nervous system.

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#3. What is the function of the housing around an x-ray tube?


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One of the primary functions of the housing is to minimize radiation leakage. The x-ray tube is lined with lead and helps minimize leakage.

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Glass tube envelopes are made of borosilicate glass. This helps with the heat inside the tube. The housing does not retain the heat from the glass tube. The housing around the x-ray tube is there for electrical shock protection. The housing around the x-ray tube has nothing to do with image production.

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#4. The reddening of irritated skin due to radiation is called what?


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Erythema is the redness of the skin caused by the congestion or increased blow flow of capillaries in the lower layers of skin. Erythema is a common side effect of radiotherapy treatment.

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Psoriasis starts underneath the skin. It is a chronic disease of the immune system. Petechiae are pinpoint, round spots that appear on the skin as a result of bleeding. Eczema is a common skin condition marked by itchy and inflamed patches of skin.

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#5. What is the position when a patient lies flat on their back and the head is lower than the feet?


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Trendelenburg is when a patient lays in a supine position with the head lower than the feet. The degree of inclination is 15-30 degrees.

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Fowler’s is when a patient is sitting up in the bed. When a patient lies on the side with the knee and thigh drawn upward toward the chest is the Sim’s position. Lateral recumbent refers to a patient that is lying on their side.

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#6. When a patient is having a barium enema, what are the instructions after the examination?


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A barium enema is an x-ray exam of the large intestine to detect any changes or abnormalities. After the exam, it is recommended to drink fluids for the next 6 hours. This will help move the barium through the bowels.

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Patients should use laxatives to help relieve the pressure in the bowels. It is very important to monitor bowel movements. Bowel movements may be light in color for up to 72 hours after a procedure and should be checked for bleeding.

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#7. The best time to use the log rolling method to move a patient is when the patient may have:


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When moving a patient with a suspected spinal injury, it is recommended to use the log rolling technique. This will minimize any damage to the spine.

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A log roll is not necessary when patient has an ankle fracture. If the patient has head trauma then stabilizing the neck is a top priority before a log roll is used.

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#8. When parts of the body are being imaged, what restricts the useful x- ray beams from causing unnecessary exposure?


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Collimation restricts the useful x-ray beam to the part of the body being imaged and thereby spares adjacent tissue from unnecessary exposure.

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Protective barrier refers to lead shielding and glass barriers. These are not used when restricting the x-ray beam. Filtration is when metal filters are used to absorb low-energy x-rays emitted from the x-ray tube. It does not restrict the x-ray beam in any way. Cassette Size is determined by the anatomy being imaged. It cannot restrict the x-ray beam.

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#9. A unit of measuring radiation is REM. What does REM stand for?


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REM (Radiation Equivalent Man) is used to express the quantity of radiation received by humans.

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Roentgen is responsible to for discovering x-rays. He is not responsible for the unit of measurement. Radioactive early management is not a term used to measure a unit of radiation. There are no acronyms that stand for radiation evolved management. This does not measure radiation.

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#10. According to the NCRP (National Council on Radiation Protection and Measurements), what is the minimum lead requirement for lead aprons?


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The NCRP requires that lead aprons have a minimum of 0.50 mm Pb.

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Lead gloves have to be 0.25 mm Pb. The thyroid shield and bucky slot cover have the same requirements. A 0.35 requirement is for lead glasses. These tend to be used in long fluoroscopy cases. There is nothing that requires a minimum of 0.75 mm Pb.

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#11. Of the total radiation exposure of the general public, what percentage comes from medical and dental radiation?


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Medical and dental radiation make up 90% of the radiation given to the general public.

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Consumer products and industrial exposure, which includes the exposure from nuclear power plants makes up 2% of radiation. Radon is 37 % of rad levels depending on the uranium content of the soil. About 5% of the radiation is from outer space and is called cosmic radiation.

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#12. What is a principle of radioprotection stating that whenever ionizing radiation has to be applied to humans it should be as far below the dose limits as practical?


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ALARA stands for “As Low As Reasonably Achievable”. This should be remembered whenever using ionizing radiation on humans.

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C/kg stands for coulomb per Kilogram. DAP stands for dose area product, a quantity used to assess a radiation risk from diagnostic x-rays. FID is short for focus to isocenter distance.

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#13. What is one of the duties of a Radiation Safety Officer?


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A Radiation Safety Officer (RSO) will schedule briefings and educational sessions to inform workers of ALARA programs and this should be done annually.

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An RSO reviews radiation levels quarterly. A radiation safety program is reviewed annually. It is an RSO’s responsibility to review radiation levels in unrestricted and restricted areas to determine that they were at ALARA levels.

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#14. What is a chemical substance that kills pathogenic bacteria?


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Disinfectants are used to kill pathogenic bacteria. These can come in liquid sprays, wipes, and aerosol.

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When preventing or arresting the growth of microorganisms, it is best to use an antiseptic. Chloroform is not used to kill any kind of bacteria. It is a liquid used as a solvent and formerly as a general anesthetic. Wet wipes are used to remove dirt and other particles from the skin.

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#15. Which of the following is considered a geometric factor that causes unequal magnification of different portions of the same object?


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When a radiographic image has unequal magnification of different portions of the same object this is called distortion. This is also considered a geometric factor.

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Quantum Mottle does not change the size of the image. It refers to the random nature in which x-rays interact with the image receptors. Noise is considered a geometric factor and is the undesired fluctuation in the optical density. It does no effect the magnification. Even though focal spot blur is considered a geometric factor, it refers to a blurred region on a radiologic image. It does not affect the magnification.

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