Chapter 5: Radiology Flashcards

1
Q

Image Gently

A

An initiative of The Society for Pediatric Radiology where dental professionals are expected to respect ALARA
Educational materials and resources for dental professionals

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2
Q

ALARA

A

As Low As Reasonably Achievable
Principle when exposing patients to ionizing radiation and to individualize and personalize prescription of radiographs to each patient

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3
Q

Biological risks of diagnostic dental radiation

A

Deterministic effects not at play
Stochastic effects are - the younger an individual and faster tissue grows, the higher the potential risk to develop a fatal cancer from being exposed to ionizing radiation

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4
Q

Dental radiographic exposure contribute ___% of total lifetime healthcare x-ray dose

A

2.5%

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5
Q

Guidelines for radiographs for patients in primary dentition at new patient exam

A

Individualized radiographic exam consisting of selected periapical/occlusal views and/or posterior bitewings if proximal surfaces cannot be visualized or probed

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6
Q

Guidelines for radiographs for patients in primary dentition at recall exam

A

With caries or high risk: Posterior bitewing exam at 6-12 month intervals if proximal surfaces cannot be visualized
Without caries or low risk: posterior bitewing exam at 12-24 month intervals if proximal surfaces cannot be examined

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7
Q

Guidelines for patient with periodontal disease

A

Clinical judgment as to need for and type of radiographic images

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8
Q

Guidelines for patient to monitor growth and development

A

Clinical judgment as to need for and type of radiographic images for primary and transitional dentition

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9
Q

Guidelines for patients in transitional dentition at new patient exam

A

Individualized radiographic exam consisting of posterior bitewings with panoramic exam or BWs and select PAs

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10
Q

Guidelines for patients in transitional dentition at recall

A

High caries risk/clinical caries: BWs 6-12 month intervals

No caries/low risk: BWs at 12-14 months

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11
Q

Guidelines for patients in permanent dentition at new patient exam

A

Individualized radiographic exam with posterior BWs, with panoramic exam or posterior BWs and select PAs. Full mouth intraoral radiographic exam preferred when patient has clinical evidence of generalized dental disease or history of extensive dental treatment

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12
Q

Guidelines for patients in permanent dentition at recall

A

High risk/caries: posterior bitewing at 6-12 month intervals

Low risk/no caries: BWs 18-36 month intervals

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13
Q

Radiation Protection Principles (3)

A

Justification Principle
Optimization Principle
Limitation Principle

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14
Q

Justification Principle

A

exposure only justified if there is no other way to obtain information and only after review of patient’s dental and medical history and clinical examination

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15
Q

Optimization Principle

A

One should always try to obtain best quality images

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16
Q

Limitation Principle

A

ALARA
Radiation dose as low as possible
Rectangular collimation (reduces 50%)
Thyroid shield
Largest image receptor possible (obtain most info)
Staff training for appropriate radiograph technique

17
Q

Cone Beam CT Benefits

A

Enhanced imaging of impacted, supernumerary teeth
Enhanced imaging and quantification of craniofacial anomalies and trauma
Planning and follow-up complex orthodontic cases/orthognathic surgery

18
Q

Image Interpretation - how to maximize interpretive yield

A

Review in environment free from distraction
Reduce room illumination to level of displayed images
Eliminate glare and adjust monitor luminance
Use magnificaiton
Utilize systemic approach
Use of software permitting adjustments of contrast, brightness and negative-positive viewing

19
Q

Radiation Hygiene for Staff/Personnel

A

Position operator behind barrier at least 6 feet from tube head
Use personal dosimeters for clinical staff members
No guidelines for pregnant employees

20
Q

Intraoral radiography types

A

Periapical radiograph (should include crown and 2mm beyond apices)
Bitewing radiograph (should not show overlap)
Occlusal radiograph
Oblique occlusal radiography

21
Q

Extraoral radiography types

A

Panoramic radiography
Cephalometric
Lateral oblique

22
Q

Type of speed of film that should be used if not using digital receptor

A

F speed

D speed should not be used

23
Q

Types of Digital Receptors

A

CCD (charged coupled devices) - small image recptors enabling instant image on monitor
Phosphor Plates

24
Q

Phosphor Plates

A

Exposure times comparable to E/F analog films, longer than CCD
Prone to bite marks and scratches
Smaller than solid state sensors (CCD)

25
Q

X-ray Machines

A

Wall mounted should be between 60-70 kVp, either fixed or adjustable mA and equipped with precise timer
Handheld: require longer exposure time
Panoramic machine: exposure time determines radiation
CBCT: needs to be placed in special room

26
Q

Pregnancy and radiation safety

A

Per American College/Congress of Obstetricians and Gynecologists say x-rays are safe for pregnant women (encourage patients to see dentist)

27
Q

Should consent for radiography imaging be obtained?

A

Yes

Record number of exposures, including remakes and diagnosis - never erase a digital image or throw away images

28
Q

Radiographs for patients with special health care needs

A

Assess patient, need, context for x-rays then engage
Assess if alternative techniques are needed or postpone exposure until patient can be managed
Can use occlusal radiographs, oblique occlusal radiographs, oblique lateral radiographs, extraoral bitewings