1. Step 1 – Heart rate. Heart rate can be calculated using the following method (if regular): ...
2. Step 2 – Heart rhythm. ...
3. Step 3 – Cardiac axis. ...
4. Step 4 – P-waves. ...
5. Step 5 – P-R interval. ...
6. Step 6 – QRS complex. ...
7. Step 7 – ST segment. ...
8. Step 8 – T waves.

The Purpose and Procedure of X-ray Imaging

If your doctor or dentist says you need an X-ray, it’s time for your bones to smile for the camera. An X-ray takes a picture of the inside of your body. Doctors use them to diagnose:

• Broken bones
• Dislocated joints
• Arthritis
• Abdominal pain, in some instances
• Cancer
• Tooth decay

Doctors can also use X-rays to find an object that a child swallowed or to check your lungs for signs of pneumonia or tuberculosis.