| The Technique |
The probe
is in contact with a layer of oil on the body or is placed in a water bath.
Gases are not transonic. |
| Types of Scan |
1. A mode 2. B mode 3.
Compund B Mode or real time mode 4. M mode or echocardiography 5. Doppler mode |
A mode |
PRINCIPLE: Returning
echoes displace the horizontal time base vertically
INDICATIONS: To examine: Midline
structures in the brain Solid or cystic structures Foreign bodies in the eye pleural
effusions, pericardial effusions and ascites To guide biopsy and amniocentesis needles.
|
B Mode |
PRINCIPLE: The returning echoes are displayed on the
oscilloscope as dots not vertical deflections
INDICATIONS
Obstetrics/Gynecology
Urology
Liver
Cardio-vascular
Breast, thyroid and spleen
|
Real
Time or Compund B Mode |
PRINCIPLE: The returning B Scan is displayed in such a way that the
movement of the object being scanned is demonstrated
USES:
Fetal movements Veins and arteries in
the abdomen
|
| Echocardiography |
PRINCIPLE: Pulsed
ultrasound from a transducer is used and continuous recording is made of the echoes
received from the various parts of the heart
INDICATIONS:
Mitral valve function, aortal and tricuspid valve
function, left ventricular function, congenital heart diseases, cardiac tumours such as
myxcoma, hypertrophic obstructive cardiomyography |
| Doppler Scan |
is used to image any structure that pulsates or moves
It is based on the principle that whenever the reflector surface moves with respect to the
transducer, there is a shift in the frequency.
used to 1. detect fetal pulses and 2. peripheral pulsations |
