Mirror or Multipart Artifact on Ultrasound Measurement

The term mirror or multipart artifact describer the situation in which the path to and from reflector are different. this artifact result in improper reflector image positioning. If separations is not stuffiest, two reflector are seen as one(missing reflector artifact). whereas reverberation and ring downs are reflections that occur back and forth within the direction of the original sound beam, a amniorim, age artifact is one in which the sound beam deflected away from transducers, The reflected may hit strong interface, to the transducer, be bounced back to the mirror and the back to the transducer. The machine will therefore receive an echo and display a blip on the screen in the direction that the traducer was pointing and at a distance corresponding to the time taken. However this will be a phantom echo since there is no interface in that position. It can also cause significant trouble when it produces a mirror image of the bladder deep to the rectum or sigmoid colon. In this situation, the phantom can closely resemble a cyst, ovarian tumor, or leiomyoma. This kind of artifact can fool even the most experienced sinologists. Differentiating between a true lesion and a mirror image artifact can be difficult. However, the phantom cyst frequently has an unusual , some what triangular shape on the longitudinal scan. The back wall is often very ill defined , whereas true cystic lesions invariably have a good , clear posterior wall. It is important to realize that this artifact is seen on both transverse and longitudinal scans, Bone can gave the patient partially empty the balder . This will cause the phantom mass to become proportionately smaller. It is , however , important that the patient doesn’t empty the balder completely as real; lesions can then be missed. Transvaginal scanning can be very useful in difficult cases.