ARTIFACTS: THEORY AND ILLUSTRATIVE EXAMPLES
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1 ARTIFACTS: THEORY AND ILLUSTRATIVE EXAMPLES Robert A. Levine, M.D. Marielle Scherrer-Crosbie, M.D. Eric M. Isselbacher, M.D. No conflicts of interest Philippe Bertrand, Pieter Vendervoort, Hasselt and Genk, Belgium, JASE
2 The danger of a noninvasive test lies in its interpretation Life-threatening artifacts: dissection, vegetation 60 year old man Cardiac source of embolus? NAME THAT MASS! 2
3 NAME THAT MASS! NAME THAT MASS: 1. Left atrial myxoma 2. Left atrial thrombus 3. Sinus of Valsalva aneurysm 4. Atrial septal aneurysm (bulging) 3
4 4
5 NAME THAT MASS: 1. Left atrial myxoma 2. Left atrial thrombus 3. Sinus of Valsalva aneurysm 4. Atrial septal aneurysm (bulging) Take Home Lesson: Look at a perpendicular view: a mass will appear solid in both views. 5
6 LA APPENDAGE CLOSURE DEVICES AMPLATZER 3D ECHO FRONTAL VIEW Apical TTE and TEE: What type of device? 6
7 JASE 2014; 27:323-8 This change in apparent shape is caused by which physical effect? 1. Scattering 2. Refraction 3. Reflection 4. Acoustic shadowing 7
8 Physics principle: Angle of reflection = angle of incidence for a specular reflector Result: Figure-of-8 artifact 8
9 This change in apparent shape is caused by which physical effect? 1. Scattering 2. Refraction 3. Reflection 4. Acoustic shadowing Result: Figure-of-8 artifact versus true shape when beam views device en face 9
10 TYPES OF ARTIFACTS More distant than the object Parallel motion: Reverberation Opposite motion: Mirror image Same distance as the object Beam width Side lobe BASIC PRINCIPLES OF ARTIFACTS The machine displays all returning echoes in the direction of the beam The distance to an echoed object is determined from the time it takes for sound to return to the transducer 10
11 Transducer Reverberations Monitor d Strong reflector d 2d Image Reverberation Reverberation Artifacts: Adjacent Cavities Aorta LA 2d d 11
12 Reverberation Artifact: Ascending Aorta in Short Axis 12
13 13
14 MULTIPLE REVERBERATIONS If an object is an artifact, color flow signal: 1. Passes through it 2. Demonstrates flow reversal near the artifact 3. Does not become turbulent in its vicinity 14
15 If an object is an artifact, color flow signal: 1. Passes through it 2. Demonstrates flow reversal near the artifact 3. Does not become turbulent in its vicinity If an object is an artifact, color flow signal: May or may not pass through it Tissue priority algorithm 15
16 Tissue priority algorithm Reverberation Artifact: Ascending Aorta in Long Axis 16
17 Reverberation Artifact: Ascending Aorta in Long Axis Color Doppler: Ascending Aorta in Long Axis 17
18 Take Home Lessons Beware of linear structures in the ascending aorta on TEE Always confirm the anatomy of linear structures in multiple views and with color flow Take your time in drawing a conclusion TYPES OF ARTIFACTS More distant than the object Parallel motion: Reverberation Opposite motion: Mirror image Same distance as the object Beam width Side lobe 18
19 What is behind the Heart? 19
20 What is behind the Heart? Mirror Image of Descending Thoracic Aorta 20
21 21
22 CASE 52 male with AFib for 1 month Sent for cardioversion (TEE) You must decide right now: Shock or not? The Challenge of the LA Appendage 22
23 The Challenge of the LA Appendage The Challenge of the LA Appendage 23
24 EVIN YUCEL EVIN YUCEL 24
25 EVIN YUCEL EVIN YUCEL 25
26 Contrast to enhance visualization of thrombus EVIN YUCEL TAKE HOME LESSONS Beware of artifacts in the LA appendage Reverberations, side lobes, and pectinate muscles common Practice looking at normals 26
27 TYPES OF ARTIFACTS More distant than the object Parallel motion: Reverberation Opposite motion: Mirror image Same distance as the object Beam width Side lobe Refraction (lens) 27
28 What is the flow in the PA? MR from out of the plane! 28
29 Take Home Message: Doppler detects flow within the full width of the beam, in and out of the plane. TYPES OF ARTIFACTS More distant than the object Parallel motion: Reverberation Opposite motion: Mirror image Same distance as the object Beam width Side lobe Refraction (lens) 29
30 Case 51 year old female with fevers and one blood culture bottle positive for gram positive cocci in clusters TTE to rule out endocarditis Case: Rule out SBE 30
31 Case: Rule out SBE Case: Rule out SBE 31
32 Case: Rule out SBE Case: Rule out SBE 32
33 This patient shows: 1. Biventricular wires 2. Reverberation 3. Mirror image 4. Side lobes 33
34 Side lobes: Laterally directed ultrasound energy arising from transducer edges Side lobe energy returning to transducer is displayed as if originating centrally 34
35 Generation of Side Lobe Artifacts Echo Map of True Object and Side Lobe Artifacts 35
36 This patient shows: 1. Biventricular wires 2. Reverberation 3. Mirror image 4. Side lobes 36
37 TEE: Aortic Dissection or Not? Case Another common finding on TTE that you may never have noticed 37
38 How Many Left Ventricles Does He Have? How Many Aortas Does He Have? 38
39 TYPES OF ARTIFACTS More distant than the object Parallel motion: Reverberation Opposite motion: Mirror image Same distance as the object Beam width Side lobe Refraction (lens) Lens Artifact Creating Twin Images 39
40 Case 75 M underwent TEE for question of dissection of the ascending aorta Referred to our hospital to repair the dissection DISSECTION FLAPS Independent mobility (unless hematoma) Cannot pass through a wall Attached, not free-floating Act as flow dividers Not always: Occur in dilated aorta (IRAD: 1/5 of acute type B not so J Vasc Surg 2012) 40
41 Case: Referral for Surgery for Aortic Dissection Case: Referral for Surgery for Aortic Dissection 41
42 Case: Referral for Surgery for Aortic Dissection Case: Referral for Surgery for Aortic Dissection 42
43 Reverberations Within an Object: Linear Structures Struck En Face by Beam Linear Artifacts from Reverberations 43
44 44
45 Case Patient with St. Jude mitral valve for 8 years Also has aortic stenosis New shortness of breath and systolic murmur? Severe AS? Prosthetic MR 45
46 Case: St. Jude MVR,?MR Case: St. Jude MVR,?MR 46
47 Pseudo MR Case: St. Jude MVR,?MR 47
48 Case: St. Jude MVR,?MR Pseudo-MR: Principles The metallic prosthesis acts as an acoustic mirror The timing of the color in the left atrium matches that in the LVOT PISA on the LV side of the valve is absent 48
49 Recognizing Pseudo-MR Prosthetic reverberations Para LAX Apical 4 49
50 Test: Real MR or Pseudo-MR? Test: Real MR or Pseudo-MR? A. Pseudo-MR B. Trace physiologic MR C. Significant MR 50
51 Test: Real MR or Pseudo-MR? Test: Real MR or Pseudo-MR? 51
52 Test: Real MR or Pseudo-MR? Test: Real MR or Pseudo-MR? 52
53 Test: Real MR or Pseudo-MR? Test: Real MR or Pseudo-MR? 53
54 Additional Mechanical Prosthetic Valve Artifacts PROBLEMS WITH INTERPRETATION 54
55 Case 48 M with shortness of breath and PVC s on monitor Abnormal EKG TTE to assess LV Assess LV Function 55
56 Assess LV Function Assess LV Function 56
57 Take Home Lessons Don t be fooled by lack of epicardial motion, especially at the apex Use color as a contrast agent to define the endocardial borders If color is ineffective, use IV echo-contrast agent Case 64 M with HTN presents with mild pulmonary edema CPK negative, troponin-t borderline Echo to assess LV function 57
58 Case: Name the Wall Motion Abnormality Case: Name the Wall Motion Abnormality 58
59 Case: Name the Wall Motion Abnormality Test: Recognizing segmental LV dysfunction A. Posterior dyskinesis B. Posterior dyssynergy C. Normal posterior wall motion D. Normal posterior wall contraction 59
60 Test: Recognizing segmental LV dysfunction 1. Posterior dyskinesis 2. Posterior dyssynergy 3. Normal posterior wall motion 4. Normal posterior wall contraction Wall Motion vs. Wall Thickening Diastole Systole 60
61 Abnormal Wall Motion despite Normal Thickening = Pseudodyskinesis Diastole Systole Wall Motion Abnormality? 61
62 Wall Motion Abnormality? Wall Motion Abnormality? 62
63 Endocardial motion does not equal LV thickening Take Home Message Look closely at wall thickening; don t get distracted by the motion Abnormal thickening is what indicates myocardial dysfunction, not abnormal motion 63
64 Clues to the Presence of An Artifact Artifacts are often linear, lack well-demarcated borders Artifacts may appear to pass through other solid structures Motion identical to a real structure Parallel or mirror image May not be reproduced in a perpendicular view Color flow not affected by it Does not have clear attachments Clues to Real Structures Distinct edges (unless thrombus) Independent motion Seen consistently in multiple views Color flow affected by structures Attached to other structures Usually have logical anatomic relationships 64
65 Bonus Case 55 year old professor with MVP and MR referred for surgery for the indication of PHTN Request for second opinion 65
66 TR max PG = 52 mmhg 66
67 67
68 TR max PG = 27 mmhg 68
69 Take Home Message: Doppler detects flow within the full width of the beam, in and out of the plane. Thank you! 69
ARTIFACTS: THEORY AND ILLUSTRATIVE EXAMPLES
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