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30 Cards in this Set

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Define posteroanterior (PA)
Pt’s chest is pressed against cassette. Beam emanating from pt’s backside.
Define anteroposterior (AP)
Pt’s back is pressed against cassette. Bema emanating from pt’s front.
How does the following film density show up on a radiographic image? 1. Air 2. Fat 3. Bone 4. soft tissue
1. air = black 2. fat = black 3. bone = white 4. soft tissue = shades of gray
Name the 4 types of densities
air, fat, bone, soft tissue
What are the 3 most common radiographic views
1. AP 2. PA 3. Lateral
What are 3 less common radiographic views
1. AP Chest 2. Apical lordodic 3. Expiratory chest
When would you want an AP Chest view
Usually in ER or hospital when pt is non-ambulatory. Heart appears larger in this view because it is farther away
What is the benefit of an expiratory chest view
can help find pneumothorax or unilateral diaphragm paralysis
Define digital radiographic image:
computed radiography. Special phosphor plate instead of film is used. Uses laser beam that causes light to be released from phosphor plate
Define contrast media:
injected IV to enhance organs and other soft tissues. It increases their density
Define Angiography:
injection of contrast media directly into a vein or artery
What are commonly used contrast agents
barium sulfate, high/low osmolar iodinated compounds, iar and gadolinium
Define sagittal/coronal/axial anatomic planes:
Sectional, cross sectional and transverse views of the body
Define helical or spiral CT:
pt continuously moves thru gantry while x-ray tube continuously encircles pt. Results in spiral configuration.
Define magnetic resonance:
hydrogen protons absorb the broadcast radio wave energy and become energized or resonate
Define magnetic resonance angiography:
image vessels without using needles, caths, or iodinated contrast media
Define Ultrasonography:
noninvasive and doesn’t use x-rays or radiation. Uses sectional anatomy and emits high-frequency sound waves
Define sound waves:
When a sound wave encounters an acoustic interface or boundary, the sound is absorbed, deflected or reflected then digitized
Define homogeneous echo pattern HEP:
Having increased or more internal echoes. Solid organs have HEP, where fluid-filled organs and masses have fewer internal echoes
Be able to describe the basic theory behind each of the diagnostic imaging modalities: CT
Computed tomography was developed in 1970’s by the Beatles. Images are produced by x-rays, detectors and computers
Be able to describe the basic theory behind each of the diagnostic imaging modalities: Ultrasound
images are produced by high-frequency sound waves, transducers and computers
Be able to describe the basic theory behind each of the diagnostic imaging modalities: MRI
Magnetic resonance imaging is produced by magnetic fields, radio-frequency waves and computers
Name some indications for ultrasound
OB
Pediatric brain
Testicle and prostate,
Female pelvis, Chest for pleural fluid drainage, Abd Vascular disease
Name some indications for CT
Trauma, Intracranial hemorrhage, ABD injuries, Fracture detection and eval, Spine alignment, Detect FB, Dx of primary or secondary neoplasms, Tumor staging
What are the contraindications for MRI
Pregancy, Cerebralaneurysms, Cardiac pacemakers, Inner ear implants, Metallic FB in and around eyes
Know the circumstances under which you would order a CT or MRI with or without contrast, and what structures you are trying to evaluate.
Contrast is used to evaluate soft tissues, angiography, myelography (spinal subarachnoid space, urinary tract, GI. Always check kidney function first!
TECH SKILLS: INTRO INTO RADIOLOGY: RADIOGRAPHIC IMAGING, CT, MRI
TECH SKILLS: INTRO INTO RADIOLOGY: RADIOGRAPHIC IMAGING, CT, MRI
What is T1 in MRI used for
tend to have excellent resolution and are used to procure anatomic information.
What is T2 in MRI used for
better contrast than T1 and cause water to light up. Used when searching for pathology which contains more water
Compare and contrast CT and MRI
CT has high resolution for imagin anatomy. MRI has high soft tissue contrast that makes it better for soft tissue imaging