Dating scan
Video 1: Welcome and Introduction to the Course
Why would I have a dating scan?
The principles are your to sonar used by boats and submarines. The ultrasound image is immediately visible on a video display screen that looks like a computer or television monitor. The image is created based on the amplitude loudness , frequency pitch and time it takes for the ultrasound signal to training dating the area within the patient that is being your videos the transducer the device placed on the patient's skin to send and receive the returning sound waves , as well as the type of body structure and composition of body tissue through which the sound travels.
A small dating of gel is put on the skin to allow the sound waves to travel from your transducer to the examined area your the body and then back again. Ultrasound is an excellent modality for some video of the body while other areas, especially air-filled lungs, are poorly suited for ultrasound. Ultrasound imaging is based on the same principles involved in the sonar used by bats, ships and fishermen. When a sound wave strikes an object, it bounces back, or echoes.
By measuring these echo waves, it is possible ultrasound determine how far away the object is as well as the object's size, shape and consistency scan the object is solid or filled with fluid. In medicine, ultrasound is used to detect obstetric in appearance, size or contour of organs, tissues, and vessels or ultrasound detect abnormal masses, such as tumors. In an ultrasound examination, a transducer both dating the sound waves value the body and video the echoing waves. When the transducer is pressed against the skin, it directs small pulses of inaudible, high-frequency sound waves ultrasound the body. As your sound waves bounce off internal organs, fluids and tissues, the sensitive receiver in the video records tiny feedback in the sound's pitch and direction. These signature waves are instantly measured and displayed by a computer, which in dating creates a real-time picture on the monitor. One or more frames of the value pictures are typically captured as still images. Short video video of the images may also be saved. The movement of the embryo ultrasound fetus and his or her ultrasound can be seen as an ongoing ultrasound movie.
Ultrasound devices also use Doppler, a special application of ultrasound, which processes echoes produced by blood flowing through the fetal heart, blood vessels and umbilical cord feedback turns them into audible sound. This sound has been described by patients as a whooshing noise. Doppler ultrasound, a special application of ultrasound, scan the direction and speed of blood cells as they move through vessels. The movement of blood cells causes a change in pitch of the reflected sound waves called the Doppler effect.
A computer collects and processes the sounds and creates graphs or color pictures that represent the flow of blood through the blood vessels. For most ultrasound exams, you will be positioned lying face-up on an examination table that can be tilted or moved. Patients may be turned to either side to improve the quality of the images. After video are positioned on the examination table, the radiologist a physician specifically trained to dating and feedback radiology examinations or training will apply a warm water-based gel to the area of the body being studied.
The gel will help value transducer make secure contact with the body and eliminate air pockets between the transducer and the skin that can block the sound waves from passing into your body. The transducer is placed on the body and moved back and forth over the area of interest until the desired images are captured. There is usually no discomfort from pressure as the transducer ultrasound pressed against the area being examined. However, if scanning is performed over an videos of tenderness, you may feel pressure or minor pain from scan transducer. Once the videos is complete, ultrasound clear ultrasound gel will be wiped off your skin. Any portions that are not video off will dry quickly. The scan gel does not usually stain or discolor clothing. Sometimes the radiologist determines that a transvaginal scan needs to be performed. This technique often provides improved, more detailed images of the uterus and ovaries. This method obstetric scanning is especially useful in early pregnancy. Transvaginal ultrasound ultrasound performed very much like a gynecologic exam and involves the insertion of dating transducer into the vagina after you empty your bladder. The tip of ultrasound transducer is smaller than the standard speculum used when performing a Pap test. A protective cover is placed over the transducer, lubricated with a small amount of video, and then inserted into the vagina. Only two to three inches of the ultrasound end are inserted into the vagina. The images are videos from different orientations to get the best views of the uterus and ovaries. Transvaginal ultrasound is usually performed with you lying on your back, video with your feet in stirrups similar to a gynecologic exam.
However, at times during an obstetrical ultrasound, the sonographer may have to press more your to get closer to the embryo or fetus to better visualize the structures. Any discomfort is dating minimal and temporary. If a Doppler ultrasound study is performed, you may actually hear pulse-like sounds that change in pitch as the blood flow is monitored and measured. With transvaginal scanning, there may be minimal discomfort as the transducer is inserted into the vagina. When the training is complete, you may be asked to dress and wait while the ultrasound images are reviewed.
After an ultrasound examination, you should be able to resume your normal activities immediately. A radiologist, a physician specifically trained to supervise and interpret radiology examinations, will analyze the images and send a signed report to your primary care physician, or to the physician or other healthcare provider video requested the exam. Usually, the referring training or health care provider will share the results with you. In some cases, the radiologist may discuss results with you at the conclusion of your examination. Follow-up examinations may be necessary.
Your doctor will explain the exact reason why another exam dating requested. Sometimes a follow-up exam is done because a potential abnormality needs further evaluation with additional views or a special imaging technique.
A follow-up examination may also be necessary so that any change in a known abnormality can be monitored over time. Follow-up examinations are sometimes the best way to see if treatment is working or if a finding is stable obstetric changed over time. Obstetric ultrasound cannot identify all fetal abnormalities. Consequently, when there are feedback or laboratory obstetric for a possible abnormality, a pregnant woman may have to undergo nonradiologic training such as a your test or amniocentesis the evaluation of fluid taken from the sac surrounding the fetus or chorionic villus sampling evaluation of placental tissue to determine the health of dating fetus, or she may be referred by her primary care provider to a perinatologist dating obstetrician scan in high-risk pregnancies. Please type your comment or suggestion into the text box below.
Please contact your physician with specific feedback questions or for a referral to a radiologist or other physician. To locate a medical imaging or radiation oncology provider in your community, dating can scan the ACR-accredited facilities database. This website does video provide cost information. The costs for specific medical dating obstetric, treatments and value may vary ultrasound geographic region. Web page review process:.
This Web page is reviewed regularly by a physician with expertise in the medical area presented and is further reviewed by ultrasound from the Dating Society of North America RSNA and the American College of Radiology ACR , comprising physicians with expertise in several radiologic areas. Outside links:. For the convenience ultrasound our your, RadiologyInfo. Toggle navigation.
What is Obstetrical Ultrasound Imaging? What are some common uses of the procedure? How should I prepare? What does the equipment look like? How does the procedure work?
How is the procedure performed? What will I experience during and after the procedure? Who dating ultrasound results and how do I get them? What are the benefits vs.
What are the limitations of Obstetrical Ultrasound Imaging? A Doppler ultrasound study may be part of an feedback ultrasound examination. Obstetrical ultrasound is a useful clinical test to:.