Radiation Protection of the Eye
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| show | a. tunica fibrosa
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| Dislocation of the eye ball foreward through the anterior orbit is a condition known as a. strabismus b. endophthalmos exophthalmos d. keratitis | show 🗑
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| which of the following are orbital defense agianst infection a. adipose deposits in the connective tissue b. the lubricating effects of blinking c. the structure of the zygoma d. arterial branching patterns of the globe | show 🗑
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| Which of the following structures encases and protects the globe and refracts light a. retina b. choroid c. cornea d. lens | show 🗑
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| older, damaged cells of the corneal epithelium are shed from the eye during blinking and tearing. The cells in this layer are repopulated every _ weeks a.1-2 b. 2-3 c. 3-4 d. 4-5 | show 🗑
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| which layer of the cornea represents 90% of its thickness and thus is an important influence on the cornea's structure and function a. bowman membrane b. stroma c. descemet membrane d. chromatin | show 🗑
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| which of the following are functions of the uvea 1. clear particulate matter from the ocular surface 2. minimize the reflection of light once it enters the eye 3. provide nutrients to the cornea and lens a.1,2 b.1,3 c.2,3 d.1,2,3 | show 🗑
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| Which of these lens structures intercepts the most energetic wavelengths of visible light energy and tend to occur at higher concentrations in infants than adults a. crystallins b. capsules c. chromophores d. fiber cells | show 🗑
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| which of the following statements are true about the fiber cells of the lens 1.fiber cells contain more cholesterol than any other cell in the human body 2. fiber cells produce crystalin a protein that helps determine how well the lens refracts light | show 🗑
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| show | b 1,3
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| which layer of the film reduces evaporation and gives the tear film structural integrity and stability a. mucoid b. middle aqueos c. anterior lipid d. goblet cell | show 🗑
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| show | a. neuron ganglia
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| show | b. retinal pigmented epithelium
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| the process by which rod and cone cells transform light energy into nerve impulses is known as photoreceptor a. transformation b. translation c. transmutation d. transduction | show 🗑
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| when photoreceptor cells are not stimulated by light, they continuously release a neurotransmitter called _ which controls the physiology of downstream neurons a. melbomian b. crystallin c. glutamate d. melanopsin | show 🗑
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| show | b Gray (Gy)
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| which of the following are characteristics of deterministic radiation effects 1. the severity of damage to tissues is dose dependent 2. The effects tend to be delayed, appearing years or even decades after exposure | show 🗑
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| which of the following are characteristics of deterministic radiation effects CONT'D 3. A dose threshold exists such that the probability of damage from low doses is negligible a. 1 & 2 b. 1 & 3 c. 2 & 3 d. 1, 2, 3, | show 🗑
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| Radiation-induced cataracts can result from a single high dose or from chronic low-dose exposure of the lens, whih is why occupational exposures over time represent a major concern for fluoroscopy operators a.True b.False | show 🗑
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| Radiation can cause complex cellular _ affects in which the exposure of a given cell population affects radiosensitivity of other cells a. collateral b. chaperone c. proximity d. bystander | show 🗑
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| The ALARA principle is based on the _ model a. precautionary risk b. deterministic dose effect c. hormesis d. linear no-threshhold | show 🗑
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| Which of the following anatomical structures is known to be more sensitive to radiation damage than the others structures a. liver b. bladder c. lung d. eye | show 🗑
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| show | c 10
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| Fluoro ops can assume that if the eye and orbit are no the targets of an interventional procedure, then there is no rad dose to the visual systems of pt's and personnel a. True b. False | show 🗑
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| The risk of any radiation induced cancer from a single fluoro exam is approximately _% per Sv a. 5 b. 6 c. 7 d. 8 | show 🗑
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| show | c. sebaceous carcinoma
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| show | c 2 & 3
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| Which of the following statements about rad retinopathy are true CONT 3. The condition is a classic example of deterministic radiation injury, with a dose threshold and dose severity relationship | show 🗑
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| what is another name for corneal ulcers a. hordeolum b. blepharitis c. conjunctivitis d. keratitis | show 🗑
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| show | A. True
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| Researchers have studied sex differences in rad cataract risk. According to some case-control studies, which group has higher rates of cataracts a.nonsmoking M older 50 b.middle-aged M w/asthma c.W receiving hormone replacement therapy d. postmenopausal W | show 🗑
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| show | A 150 mSv
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| show | a. 2
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| A recent study of cateract formation among rad tech's found that workers with high average lifetime occ rad doses to the eye significantly more likely to develop cataracts after 20 yrs. The author questioned | show 🗑
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| The author questioned CONT a geographic diff in ultraviolet light exp to the eyes influence catarac formation b. there is a safe lower dose threshold for cataract formation | show 🗑
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| The authors questioned CONT c. the use of fluoro should be curtailed because of potential damage to the eyes d. dry eye syndrome was related to radioinduced cataract formation | show 🗑
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| According to the article why have rad doses and reports on significant tissue injury from interventional fluoro procedures increased over the past 2 decades a. Pro Org's have not established safety standards for fluoro procedures | show 🗑
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| show | d. More complex and time consuming
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| Which of the following is not a principle used to manage rad exposure to PT's & Health care personnel a. duration b. distance c. protection d. contrast | show 🗑
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| with respect to fluoro dosimetry which measurement is calculated as the air kerma across the x-ray beam and is used as a proxy for PT dose a. radiation field gradient b. reference dose index c. cumulative kerma sum d. kerma-area product | show 🗑
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| show | b 22
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| Which of the following is a sentinel event requiring a PT to be monitored for radiation injury? 1.Peak skin dose exceeds 2,000 mGy 2. reference point air kerma exceeds 5K mGy 3. Fluoro procedure exceeds 1 hr a. 1,2 b.1,3 c. 2,3 d. 1,2,3 | show 🗑
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| According to the article, which of the following is not a QA program component a. signage near the fluoro room reminding staff to use eye shielding b. periodic review of fluoro protocols that help minimize dose to the eye | show 🗑
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| show | d calibration of fluoro equipment
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| if fluoro personnel fail to report doses for less than _ % of procedures, the facility should consider implementing new radiation safety training and continuing education a. 95 b. 85 c. 75 d. 65 | show 🗑
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| Which of the following patient characteristics can effect the risk of radiation injury to the eyes, particularly from high-dose procedures a. asthma b. small body mass c. presbyopia d. fair skin | show 🗑
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| adadadad | show 🗑
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