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The second important principle is that the imaging wave does not penetrate deep into the bone tissue, i.e. at the bone surface the wave is completely reflected. Thus, it is not possible to image soft structures “hidden” behind the bone.
Ultrasound is a highly subjective examination, highly dependent on the skills and experience of the performing physician, not using a clearly defined imaging technique (planes, standardised examination patterns). This has its pros and cons. The obvious downside - lack of objectivity. The plus side is the possibility of shaping the examination during its course, modifying its scope, smoothly following the curvature of structures that do not run in standard planes (e.g. nerves), which is not possible with the MR method.
An often highlighted advantage of musculoskeletal ultrasound examination is the possibility of dynamic assessment of structures (functional, in motion). It is worth emphasising that the functional assessment is not a separate examination (the so-called dynamic ultrasound examination), but a component of a complete ultrasound examination. Depending on the needs, e.g. in case of suspected joint instability or a “snapping” tendon during the examination, a dynamic assessment is performed. Identically, when assessing the activity of the inflammatory process, Doppler applications are used to assess vascularisation. Everything is still a single musculoskeletal ultrasound examination.
How do I prepare for ultrasound examination?
Ultrasound is non-invasive and safe and can therefore be repeated at short intervals. It shows the size and shape of individual structures and organs. Delivery injections and biopsies are also performed under its supervision.
Ultrasound of the locomotor system
When is a musculoskeletal ultrasound examination not possible?
– relative contraindication for performing the ultrasound examination are always open, unhealed wounds in the place of examination
– it is not possible to perform the ultrasound examination in a full plaster dressing, it is necessary to cut it beforehand in the surgical outpatient clinic.
Dress comfortably, preferably in loose sportswear allowing easy access to the body part being examined. Also pay attention to personal hygiene. Be sure to bring your medical and radiological records for the area being examined. Previous X-ray, ultrasound, MRI, CT examinations will be very helpful.
Abdominal ultrasound
When is abdominal cavity ultrasound examination not possible?
– relative contraindication to ultrasound is always open, unhealed wounds of the examination area
Do not eat for at least five hours before the scheduled examination time. Drink still mineral water and come with a full bladder. On the day before the examination, take an antiflatulence medicine such as Espumisan or similar – two pills three times a day.
