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Vector Tissue Doppler Ultrasound Effective Tool for Imaging Muscle, Tendon Motion

By MedImaging International staff writers
Posted on 07 Oct 2013
Image: Scientists have developed a new approach that utilizes a Doppler ultrasound for quantifying muscle kinematics (Photo courtesy of George Mason University).
Image: Scientists have developed a new approach that utilizes a Doppler ultrasound for quantifying muscle kinematics (Photo courtesy of George Mason University).
Scientists have developed a new approach that utilizes a Doppler ultrasound for quantifying muscle kinematics. The new technology, which has been designed to image muscle and tendon motion during dynamic tasks, can provide a complementary methodological tool for biomechanical studies in a clinical or laboratory setting.

Injured and painful joints feature complicated dynamics the understanding of which can help clinicians figure out how to address a variety of conditions. To visualize the processes involved in muscle and tendon dynamic tasks, the patient has to be imaged while using the injured joint.

The investigators have developed an innovative vector tissue Doppler imaging (vTDI) technique that can be used to measure musculoskeletal contraction velocity, strain, and strain rate with submillisecond temporal resolution during dynamic activities using ultrasound. The researchers from George Mason University (Fairfax, VA, USA) have devised the new technology that uses existing modalities to provide a comprehensive picture as to how the musculoskeletal parts of the leg function.

Little white balls are fixed to specific points all over the patient’s body and a Doppler ultrasound probe is attached to the leg. The patient is then asked to perform a number of tasks while the ultrasound is recording and cameras monitor the balls to determine exactly how the individual is moving. Fusing the two modalities together provides a new ability to optimize the effectiveness of biomechanical studies. Moreover, other techniques, such as electromyography (EMG), can be used in conjunction to gain additional data.

The study’s findings were published in an open access article with a video in September 2013 in the journal JoVE. The aim of this early study was to investigate the repeatability and potential applicability of the vTDI technique in measuring musculoskeletal velocities during a drop-landing task, in healthy subjects.

The vTDI measurements can be performed concurrently with other biomechanical techniques, such as three-dimensional (3D) motion capture for joint kinematics and kinetics, EMG for timing of muscle activation and force plates for ground reaction force. Integration of these complementary techniques could lead to a better understanding of dynamic muscle function and dysfunction underlying the pathogenesis and pathophysiology of musculoskeletal disorders.

Diagnostic ultrasound can enable direct imaging of muscle and tendons in real time, and therefore is an attractive alternative for measuring musculoskeletal dynamics and function during ADL. Ultrasound-based quantitative measures of muscle morphology and architecture, such as muscle thickness, length, width, cross-sectional area (CSA), fiber pennation angle and fascicle length have been widely used. Image-processing methods have recently been employed to assess and quantify these quantitative measures during dynamic tasks. These advances have enabled a new methodological approach to understanding in vivo muscle function. However, these methods have primarily relied on using conventional grayscale (or B-mode) ultrasound imaging, and therefore have not fully exploited the possibilities of ultrasound to measure tissue velocities, strain, and strain rate using Doppler principles, that have been shown to be valuable in evaluating cardiac muscle function.

The vTDI technique can make measurements of muscles and tendons during highly dynamic tasks (e.g., drop-landing, gait) at high frame rates. The investigators have implemented this method on a commercially available ultrasound system with a research interface, enabling this study to be made in a clinical setting.

Vector TDI is based on estimating the resultant velocity vector from Doppler velocity measurements taken from two or more independent directions. An ultrasound system with a research interface was used for developing vTDI. The research interface allowed low-level beam forming and pulse sequence control using a software development kit (SDK). A 5–14 MHz linear array transducer, consisting of 128 transducer elements and with a 38-mm field-of-view was used. The research interface was employed to split the array transducer into two transmit and receive apertures and steer the receive beams by 15° with respect to the normal. The transmit beam was focused in the region of interest (e.g., muscle belly). Transmit and receive apertures were set to 32 elements.

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87 (!!!!! 2303.8387298584): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (57.93571472168): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (612.02049255371): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (!!!!! 7425.06980896): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (!!!!! 7978.9161682129): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (!!!!! 7891.8933868408): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (!!!!! 7962.9421234131): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 7863.0447387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (!!!!! 7948.8754272461): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (!!!!! 7768.1541442871): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (!!!!! 7476.806640625): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (!!!!! 4871.8452453613): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (562.90626525879): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (!!!!! 1586.9140625): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (65.088272094727): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (!!!!! 1829.8625946045): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (!!!!! 3114.9387359619): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 8034.2292785645): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
105 (!!!!! 7339.0007019043): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
106 (259.8762512207): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 1013.0405426025): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 2748.966217041): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
109 (478.98292541504): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
110 (!!!!! 7925.0335693359): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 4719.9726104736): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 7094.144821167): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (!!!!! 8049.9649047852): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (!!!!! 7619.1425323486): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
115 (!!!!! 7702.8274536133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
116 (!!!!! 8058.0711364746): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
117 (!!!!! 7923.1262207031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
118 (!!!!! 7663.0115509033): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
119 (!!!!! 7671.1177825928): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
120 (!!!!! 11676.073074341): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
121 (!!!!! 5493.8793182373): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
122 (!!!!! 7929.0866851807): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 99607.944488525): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (829.93507385254): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294748525 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294748525 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (535.96496582031): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (125.88500976562): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (609.8747253418): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (154.01840209961): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (!!!!! 1281.0230255127): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (66.995620727539): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (!!!!! 1470.0889587402): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (809.90791320801): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (86.069107055664): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (391.96014404297): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (!!!!! 2163.8870239258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 1156.0916900635): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 3106.8325042725): SELECT name FROM jos_deeppockets WHERE id=214
138 (113.01040649414): SELECT name FROM jos_deeppockets WHERE id=214
139 (!!!!! 1048.8033294678): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (913.85841369629): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 3723.8597869873): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
142 (130.89179992676): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
143 (!!!!! 27327.060699463): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 5280.9715270996): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 6486.177444458): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294748525 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 3062.0098114014): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (574.82719421387): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 2187.967300415): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
149 (369.78721618652): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
150 (!!!!! 2902.9846191406): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (988.96026611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
152 (781.05926513672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
153 (834.94186401367): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294748525 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294748525 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (880.95664978027): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=214 or channel_id is null)
155 (186.92016601562): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=214 or channel_id is null)
156 (855.92269897461): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 8353.9485931396): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
158 (!!!!! 7838.0107879639): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294748525 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294748525 AND published='1' LIMIT 1
159 (902.17590332031): select jos_twitters.link from jos_twitters where cat=10
160 (624.17984008789): select jos_facebook.link from jos_facebook where cat=10
161 (363.11149597168): select jos_google_plus.link from jos_google_plus where cat=10
162 (463.96255493164): select jos_linkedin.link from jos_linkedin where cat=10