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2015-2016 Core Physics Review Opening Lecture

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Opening Lecture Outline Part 1: Strategy Top four reasons to learn radiology physics Your study plan for the year – 10 sections Three question types you need to know Part 2: X-Ray Production Photons & X-Ray Tubes Braking & Characteristic Radiation MCQ Checkpoint

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How far along are you in training?


a) PGY-2 b) PGY-3 c) PGY-4 d) PGY-5 e) Other

What does your life look like after training?


a) academic radiology b) private practice c) business/startup d) research only e) other

How stressed are you about Physics on the Core Exam?


A B C D E



Opening Lecture Outline Part 1: Strategy Top four reasons to learn radiology physics Your study plan for the year – 10 sections Three question types you need to know Part 2: X-Ray Production Photons & X-Ray Tubes Braking & Characteristic Radiation MCQ Checkpoint

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MCQ Checkpoint: X-Ray Production

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2015-2016 Core Physics Review: Opening Lecture ABR Physics Review


What is the k-shell binding energy of W in keV? (a) 21 (b) 48 (c) 68 (d) 70 (e) 72

MCQ Checkpoint Question 1/4



What is the k-shell binding energy of W in keV? (a) 21 (b) 48 (c) 68 (d) 70 (e) 72






Which type of x-ray is most critical for imaging in most present-day mammography? (a) Characteristic (b) Braking (c) Photoelectric (d) Compton





Which type of x-ray is most critical for imaging in most present-day mammography? (a) Characteristic (b) Braking (c) Photoelectric (d) Compton



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The photon energy spectrum changed.

Which single parameter adjustment could guarantee this change whether or not a phototimer was used? (a) kVp (b) mA∙s (c) mA (d) tube current

# p

ho

ton

s

photon energy (keV)





What happens to average photon energy if you increase kVp by 2x? (a) goes up by highly variable amount (b) unchanged (c) goes down by highly variable amount (d) decreases by ½ (e) Increases by 2





What happens to average photon energy if you increase kVp by 2x? (a) goes up by highly variable amount (b) unchanged (c) goes down by highly variable amount (d) decreases by ½ (e) Increases by 2


kV_average ≈ 0.5 x kVp in conventional

radiography



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