Editing Medical ultrasound (section)

=== Compression ultrasonography ===
Compression ultrasonography is when the probe is pressed against the skin. This can bring the target structure closer to the probe, increasing spatial resolution of it. Comparison of the shape of the target structure before and after compression can aid in diagnosis.

It is used in [[ultrasonography of deep venous thrombosis]], wherein absence of vein compressibility is a strong indicator of thrombosis.<ref name="JAMA">{{cite journal |doi=10.1136/bmj.316.7124.17 |title=Compression ultrasonography for diagnostic management of patients with clinically suspected deep vein thrombosis: Prospective cohort study |year=1998 |last1=Cogo |first1=A. |last2=Lensing |first2=A. W A |last3=Koopman |first3=M. M W |last4=Piovella |first4=F. |last5=Siragusa |first5=S. |last6=Wells |first6=P. S |last7=Villalta |first7=S. |last8=Büller |first8=H. R |last9=Turpie |first9=A. G G |last10=Prandoni |first10=P. |journal=BMJ |volume=316 |issue=7124 |pages=17–20 |pmid=9451260 |pmc=2665362}}</ref> Compression ultrasonography has both high [[sensitivity and specificity]] for detecting proximal deep vein thrombosis in symptomatic patients. Results are not reliable when the patient is asymptomatic, for example in high risk postoperative orthopedic patients.<ref name=medscape>{{cite journal |doi=10.7326/0003-4819-128-8-199804150-00011 |title=Noninvasive Diagnosis of Deep Venous Thrombosis |year=1998 |last1=Kearon |first1=Clive |journal=Annals of Internal Medicine |volume=128 |issue=8 |pages=663–77 |pmid=9537941 |last2=Julian |first2=JA |last3=Newman |first3=TE |last4=Ginsberg |first4=JS|s2cid=13467218 }}</ref><ref>{{cite journal |doi=10.1016/S0140-6736(94)90240-2 |title=Limitations of compression ultrasound for the detection of symptomless postoperative deep vein thrombosis |year=1994 |last1=Jongbloets |first1=L.M.M. |last2=Koopman |first2=M.M.W. |last3=Büller |first3=H.R. |last4=Ten Cate |first4=J.W. |last5=Lensing |first5=A.W.A. |journal=The Lancet |volume=343 |issue=8906 |pages=1142–4 |pmid=7910237|s2cid=23576444 }}</ref>

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File:Ultrasonography of a normal appendix without and with compression.jpg|A normal [[appendix (anatomy)|appendix]] without and with compression. Absence of compressibility indicates [[appendicitis]].<ref>{{cite journal|last1=Reddan|first1=Tristan|last2=Corness|first2=Jonathan|last3=Mengersen|first3=Kerrie|author3-link= Kerrie Mengersen |last4=Harden|first4=Fiona|title=Ultrasound of paediatric appendicitis and its secondary sonographic signs: providing a more meaningful finding|journal=Journal of Medical Radiation Sciences|date=March 2016|volume=63|issue=1|pages=59–66|doi=10.1002/jmrs.154|pmid=27087976|pmc=4775827}}</ref>
File:Ultrasonographic measurement of aortic diameter at the navel.svg|Compression is used in this ultrasonograph to get closer to the [[abdominal aorta]], making the [[superior mesenteric vein]] and the [[inferior vena cava]] look rather flat.
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