Penumbra Study guides, Class notes & Summaries

___ energy does NOT have sharper penumbra - ANSWERLower Edge of the field represents - ANSWER50% idodose line Which is more difficult to measure 4X4 or 20x20 field size? - ANSWER4x4 because penumbra region is larger Cobalt machine has larger penumbra than LINAC because - ANSWERLarger source size Field size defined at intersection - ANSWER50% isodose line Increase SSD, _________ penumbra? - ANSWERincrease wedge factor, ____ Mu? - ANSWERIncrease Wedge angle - ANSWERangle of ...

What does stroke recovery result from? correct answer: Recovery of the ischemic penumbra (restoring blood flow) Resolution of cerebellar edema Neuroplasticity and rehabilitation What are better outcomes of stroke recovery associated with? correct answer: Early medical care Smaller strokes (more focal) Specialized stroke care centers Early intensive multidisciplinary rehab (mobility ASAP) Is stroke recovery the same for all patients? correct answer: NO - highly variable Ex. ...

Permissive Hypertension Phenomenon: After an acute ischemic stroke, the body senses the need for increased pressure to perfuse the penumbra (area of swollen and vulnerable but salvageable brain tissue) to keep the stroke from extending), autocorrects within 24 - 48 hours without treatment >220/120 mm Hg Blood pressure that would require treatment after ischemic stroke or hemorrhagic stroke labetalol [Normodyne], nicardipine [Cardene] IV antihypertensives that are often used if medicati...

A step wedge can be used to demonstrate A. penumbra B. film contrast C. magnification of image D. film composition - correct answerB On a radiograph, what is the dense radiopaque band that outlines the edge of the mandible? A. Mylohyoid ridge B. Inferior border C. Mental protuberance D. Oblique ridge - correct answerB Which the following quality control tests evaluates safe lighting in the darkroom? A. Timer test B. Step wedge C. Coin test D. Normalizing device - correct answe...

SCRN Question and answers 100% correct 2024How many cranial nerves are there? - correct answer 12 pairs How many spinal nerves are there? - correct answer 31 pairs Penumbra - correct answer Area of ischemic brain tissue that is potentially reversible What are the two types of hemorrhagic stroke? - correct answer intracerebral hemorrhage and subarachnoid hemorrhage What are some causes of intracerebral hemorrhage? - correct answer HTN, drug use, cerebral amyloid angiopathy, ...

Dosimetry Final Exam Question and answers correctly solved 2023What are the three components of the penumbra? - correct answer geometry, transmission, and lateral scattering Geometric Penumbra - correct answer is due to the finite source size. It is more of a concern in Co-60 machines where the source is between 1 and 2 cm in size. Transmission Penumbra - correct answer is due to the transmission of photons through the primary, secondary, or tertiary collimators

If the number of fields increases what happens to beam uniformity? - ANSWERit increases If beam energy increases what happens to the beam uniformity? - ANSWERit increases If you increase patient thickness increases what happens to beam energy? - ANSWERit decreases if you increase SSD what happens to penumbra - ANSWERit increases if sdd increases what happens to penumbra - ANSWERit decreases if you increase source size what happens to penumbra - ANSWERit increases if you increas...

If your patient has a hemorrhagic stroke, the cause might be: an irregular heart beat atherosclerosis of a blood vessel in or leading to the brain an aneurysm which has burst an embolus from the internal carotid artery correct answers an aneurysm which has burst Which of the following is caused by the scarring of motor nerves and associated muscle atrophy due to disuse? Multiple sclerosis Amyotrophic Lateral Sclerosis Parkinson's disease Alzheimer's disease correct answers Amyotroph...

NR 507 FINAL EXAM QUESTIONS AND ANSWERS ALREADY PASSED Dermatomes area of the skin that is mainly supplied by branches of a single spinal sensory nerve root. These spinal sensory nerves enter the nerve root at the spinal cord, and their branches reach to the periphery of the body. Substance release at the synapse Acetylcholine- Excitatory or inhibitory- alzheimers Norepi- Excitatory or inhibitory- sleep/wake cycle, SYNS transmission Dopa- Excitatory (h1 and h2 receptors) and inhibitory (H3 re...

What does stroke recovery result from? - ANSWER-Recovery of the ischemic penumbra (restoring blood flow) Resolution of cerebellar edema Neuroplasticity and rehabilitation What are better outcomes of stroke recovery associated with? - ANSWER-Early medical care Smaller strokes (more focal) Specialized stroke care centers Early intensive multidisciplinary rehab (mobility ASAP) Is stroke recovery the same for all patients? - ANSWER-NO - highly variable Ex. Hemorrhagic pts tend to not recov...