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What is Ultrasound Imaging?
Ultrasound (US) imaging or Ultrasound scanning or Sonography is a method of seeing inside the body using high-frequency sound waves. The sound waves are recorded and displayed as real-time visual images. No radiation is used in Ultrasound imaging.
Ultrasound is a noninvasive method used to examine internal body organs. We routinely image gallbladder, liver, spleen, pancreas, kidneys, bladder, venous or arterial vessels. Ultrasound is also the preferred image modality for diagnosis and monitoring of pregnant women and their unborn infants.
What are the Preps for Ultrasound Imaging?
Patients should be instructed to wear comfortable, loose fitting clothing for an Ultrasound procedure. Ultrasound preps vary. Some scans require patients to be held NPO after midnight while others will require patients to drink up to six glasses of water and to arrive with a full bladder.
Ultrasound Prep Guide
| Procedure | Prep | Estimate Time of Exam |
|---|---|---|
| Gallbladder | AM Prep - NPO after midnight until appointment PM Prep - NPO 6 hours prior to appointment |
20 minutes |
| Abdomen | AM Prep - NPO after midnight until appointment Diabetic patients should not take insulin |
20 to 30 minutes |
| Pelvis | Patient must have full bladder upon arrival Drink 3 to 6 large glasses of tap water 1 hour prior to appointment |
30 minutes |
| Renal | Fluids are encouraged unless patient is scheduled for IVP also which prep is NPO | 30 minutes |
| Thyroid | May continue with routine meals and medication | 30 minutes |
| Transcranial Doppler (TCD) | No Prep | 1 hour minimum |
| Thoracentesis/Paracentesis | No prep | 20 minutes |
| Renal Biopsy | Clear liquids | 30-45 minutes |
| Biopsy (Liver, etc) | Clear liquids | 20 minutes |
| Carotid | No Prep | 30 minutes |
| Breast | May continue with routine meals and medication | 30 minutes |
| Obstetric | Patient should have full bladder upon arrival If transvaginal exam is indicated patient will empty bladder |
30 minutes |
| Scrotal | May continue with routine meals and medication | 30 minutes |
| Color Flow Venous | May continue with routine meals and medication This is Ultrasound evaluation of venous blood flow in the leg or legs. |
30-45 minutes per exam |
How does Ultrasound work?
Ultrasound imaging is based on the same principles involved in the sonar used by ships or submarines at sea. Sound waves are generated and echoes are recorded. The Ultrasound transducer generates sound waves (like a speaker) and records the returning echoes (like a microphone). As the sound passes through the body echoes are produced that can be used to identify the size, shape, and density of anatomy inside the body. These echoes are instantly measured and displayed by a computer, which in turn creates a real-time picture on a TV monitor. The live images can be recorded on videotape or captured as a still image on film.
How is the Ultrasound Exam performed?
The patient is positioned usually supine on an examination table and an Ultrasound Technologist will apply a liquid gel to the skin. The gel will help maintain close contact between the skin and transducer. This will eliminate any air pockets and ensure sound waves are freely conducted into and out of the body. The Technologist will press the transducer firmly against the skin and sweeps it back and forth over the area of interest.
For Pelvis or Obstetric procedures, if requested by the referring physician or radiologist, a transvaginal scan will be performed. The endovaginal transducer is placed in the vagina. This technique provides improved images of the uterus and ovaries. It is especially useful in early pregnancy.
What are common uses of Ultrasound Imaging?
Radiology Report Turnaround Process
A Radiologist, who is a physician experienced in Ultrasound Imaging and other radiology procedures will analyze the images and send a report to the patient’s referring physician. The referring physician will inform the patient of the Ultrasound findings.
We have a departmental goal of 6 hours for Radiology Report Turnaround time. We measure the time from radiology request entry to the time the transcriptionist types the final report. The radiology report is also available via our Digital Dictation System, immediately after Radiologist completes dictation. The DVI system phone number is 377-3745. You must first enter your six (6) digit PIN number, your department number, and the patient’s medical record number to access the report.
What are the Benefits VS Risks?
Benefits-
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