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A-0766 Toward standardization of an anatomical coordinate system for the radius in 3D imaging: reliability of automatic and manual placement
Marieke GA de Roo 1,2, Johannes GG Dobbe 2, Geert J Streekstra 2, Simon D Strackee 1, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, the Netherlands
Thursday, June 14, 2018 · 9:06 a.m. · 04m 13s
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00:00:01
mm kay morning everyone uh you know a a one and the second one also uh
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and also a bit on this uh the first thing i want to tell you about is our aim at that position
00:00:18
of an anatomical coordinate system for the radius in three d.
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imaging and we tested the reliability of automatic menu placements
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uh but fierce uh first clinicians whining from bother about the radio coordinate system
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was actually calming use you see it uh when you have
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a really smell you and you have three surgical planning
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um then you express the uh repositioning parameters in
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a with regard to this coordinate system
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or when talk about forty croaking magic's you position a cornet system on the rate is
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and you express the motion of the cardinals with respect to discordant
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system in about this uh for basically will be my next
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uh but what is the problem well uh between hospitals and also
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between research you see difference can thanks of the radius
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um and we want to know if that actually matters in positioning discordant
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system because we want a unilateral positioning so we can compare research
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uh it's this was the for this does the image length of
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the radius significant effects the position are of this government's is
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what we did was we took eighty five l. c. completely scan rainy i
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yeah we systematically shorten them instead of ten percent uh with our own uh some late software
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uh and we that physicians man replace accorded system and
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also we're a computerised everything position the court system
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then we uh took a gold standard across the gold standard was a completely scan radius in which
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the uh automatic placement position the corn system and then we looked at the error in positioning
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this is for example impair you get when you only have ten percent of the radius net
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and the automatic positioning positions important system then what you see is
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you get a translation error so the point of insertion changes
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and you also get a rotation arrow so here you see the exact this that axes
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no points throughout the sign up process uh and for example
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the y. axis is completely shifted one eighty degrees
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so we compared uh the uh accuracy imposition of positioning
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of the automatic menu placement and d. r. results
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uh the subject is with what you see is on the left crossed the translation or rotation error
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and on the y. axis you have the translation or rotation are in millimetres or degrees
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on the x. axis you have the radio length and from ten
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centimetres that short on to one percent completely scan breeze
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and what you see is for translation error that uh with manual placements
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uh it doesn't matter how long the baby is is
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the uh menu placement there is approximately two millimetres
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then uh when you look at the rotation error you see
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that for seventy two ninety percent uh there's a difference
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um in the dispersion for that that's these are the hatch there
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i'm in favour of the automatic placement in only ninety percent
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also the difference in the median is statistically significant
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but uh for the rest a doctor pretty good at correcting this rotation air
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and you see if there's only ten percent that we out for a a computer
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uh therefore in conclusion if you have a short scamper yes uh
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less than twenty percent recording system should be placed a manually
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uh and you always take it i got it yet is two millimetre of translation error
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uh and when you're more and ability to a position with an algorithm
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you should try to position it with a a computerised basement
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