Medical Imaging G485 Fields, Particles, Frontiers of

Physics

KS5 OCR PHYSICS H158/H558Mr Powell 2012

Index

5.4.1 X-Rays5.4.2 Diagnosis

methods in medicine

5.4.3 Ultrasound

Mr Powell 2014

5.4.3 Ultrasound

Assessable learning outcomes..

(a) describe the properties of ultrasound; (b) describe the piezoelectric effect; (c) explain how ultrasound transducers emit and receive high-frequency sound;

(d) describe the principles of ultrasound scanning;

(e) describe the difference between A-scan and B-scan;

(f) calculate the acoustic impedance using the equation Z = ρc;

(g) calculate the fraction of reflected intensity using the equation ....

(h) describe the importance of impedance matching;

(i) explain why a gel is required for effective ultrasound imaging techniques.

Ultrasound Key Points to Answer..... (use the resources you have been give to make notes on each topic with diagrams, tables and text to support your points), you can review progress at the end of the booklet each lesson

1) What is the main principle of an ultrasound scan? (Explaining)

2) How does ultrasound use the piezoelectric effect? (Harder)

3) Explain in detail (steps) how an ultrasound scan works? (Harder)

4) Describe the difference between A-scan and B-scan (Explaining – Basic / Harder)

5) Can you draw a diagram to explain how a scanner can tell what material a subject is made from? (Pictorial)

6) What is Z = ρc used for (Maths)

7) How do you calculate the fraction of reflected intensity using an equation (Harder - Maths)

8) What is impedance matching? (Pictorial + Explaining)

9) Why do we need ultrasound gel?

Summary - Aims a-e

(f) calculate the acoustic impedance using the equation Z = ρc;(g) calculate the fraction of reflected intensity using the equation ....(i) explain why a gel is required for effective ultrasound imaging techniques.

Calculations...

Discussion

Units & Maths

Extra Details

Extra Details

Ultrasound - "Progress Review" Confident or Achieved

Mainly Confident

Need to study at home/ Not

ConfidentNeed to review

with Teacher

1) What is the main principle of an ultrasound scan? (Explaining)

2) How does ultrasound use the piezoelectric effect? (Harder)

3) Explain in detail (steps) how an ultrasound scan works? (Harder)

4) Describe the difference between A-scan and B-scan (Explaining – Basic / Harder)

5) Can you draw a diagram to explain how a scanner can tell what material a subject is made from? (Pictorial)

6) What is Z = ρc used for (Maths)

7) How do you calculate the fraction of reflected intensity using an equation (Harder - Maths)

8) What is impedance matching? (Pictorial + Explaining)

9) Why do we need ultrasound gel? 10) Completed both practice questions in class

11) Attempted extra questions from book or OCR testbase outside of the lesson

Overall Teacher/Student Comments * / I/ Reply