98. MRI: VOLUME COILS

Question 1

1. Where do we find volume Coils?

Answer 1

• they surround the whole body
• or they can surround a specific region

Question 2

2. What can be said about the Signal to Noise Ratio that is obtained using the Volume Coils?

Answer 2

• the Signal to Noise Ratio is less than the one that is
  obtained by the Surface Coils or the Phased-Array Coils

Question 3

3. What are two examples of Volume Coils?

Answer 3

1. Body Coils
2. Head Coils

Question 4

4. What is the main coil of the magnet called?

Answer 4

• this is the Body Coil
• it is found in the Magnet Bore

Question 5

5. What are some examples of types of MRI Volume Coils?

Answer 5

1. Circularly Polarised Coils
2. Quadrature Coils
3. Bird cage Coils
4. Crossed Coil
5. Helmholtz Coil
6. Pair Coils
7. Paired Saddle Coils
8. Single Turn Solenoids

Question 6

6. What does this image show?

Answer 6

• this is a Bird Cage Coil
• it images the Head, Brain and Joints

Question 7

7. What parts of the body do we image using Volume Coils?

Answer 7

1. Elbow
2. Wrist
3. Hand
4. Knee
5. Foot
6. Ankle
7. Thorax
8. Abdomen

WE USE THE BODY COIL TO IMAGE THE:
- thorax
- abdomen

Question 8

8. What are Phased Array Coils?

Answer 8

• they consist of multiple Coils
• they consist of multiple Receivers
• the individual signals received are combined to create
  one image

THE COMBINED SIGNALS:
- improve the Signal to Noise Ratio
- they increase the coverage

Question 9

9. What are the advantages of Small Surface Coils?

Answer 9

• they are combined with a large Field of view
• this increases the amount of anatomy that is covered

Question 10

10. How many coils and receivers are usually grouped together?

Answer 10

• 4

Question 11

11. Why do we combine the coils and the receivers?

Answer 11

• this increases the longitudinal coverage
• this improves the uniformity across the whole volume
  of the patient being examined

Question 12

12. What body parts are examined using the Phased Array Coils?

Answer 12

1. Thorax
2. Abdomen
3. Pelvic Region
4. Extra Cranial Angiography
5. Extra Cranial Venography
6. Upper and lower extremities
7. The Total Spine
8. The Breast
9. The Joints