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untracked freehand method

English translation: see explanation from article

11:03 Dec 7, 2004
English language (monolingual) [PRO]
Medical - Medical: Instruments
English term or phrase: untracked freehand method
You can not make accurate measurements on a 3-D data set acquired using the untracked freehand method
repro59
Selected answer:see explanation from article
Explanation:
Tracked Freehand Systems.—With tracked freehand systems, the operator holds an assembly composed of the transducer with an attachment and manipulates it over the anatomic area being evaluated (Fig 1). Two-dimensional images are digitized as the transducer is moved. During this procedure, the exact relative position and angulation of the US transducer must be known for each digitized image, and the operator must ensure that there are no significant imaging gaps.

Untracked Freehand Systems.—With untracked freehand systems, 2D images are digitized as the operator moves the transducer with a smooth, steady motion (Fig 2). Although this technique is usually the most convenient for the operator, image quality is variable and depends largely on how smoothly and steadily the operator moves the transducer. To reconstruct a 3D image, a linear or angular space between digitized images is assumed. Geometric measurements such as distance or volume may be inaccurate and should not be taken because there is no direct information regarding the relative position of the digitized images.
Selected response from:

David Russi
United States
Local time: 07:16
Grading comment
Thank you very much!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
5 +1see explanation from article
David Russi


  

Answers


3 hrs   confidence: Answerer confidence 5/5 peer agreement (net): +1
see explanation from article


Explanation:
Tracked Freehand Systems.—With tracked freehand systems, the operator holds an assembly composed of the transducer with an attachment and manipulates it over the anatomic area being evaluated (Fig 1). Two-dimensional images are digitized as the transducer is moved. During this procedure, the exact relative position and angulation of the US transducer must be known for each digitized image, and the operator must ensure that there are no significant imaging gaps.

Untracked Freehand Systems.—With untracked freehand systems, 2D images are digitized as the operator moves the transducer with a smooth, steady motion (Fig 2). Although this technique is usually the most convenient for the operator, image quality is variable and depends largely on how smoothly and steadily the operator moves the transducer. To reconstruct a 3D image, a linear or angular space between digitized images is assumed. Geometric measurements such as distance or volume may be inaccurate and should not be taken because there is no direct information regarding the relative position of the digitized images.


    Reference: http://radiographics.rsnajnls.org/cgi/content/full/20/2/559
David Russi
United States
Local time: 07:16
Specializes in field
Native speaker of: Native in EnglishEnglish, Native in SpanishSpanish
PRO pts in category: 20
Grading comment
Thank you very much!

Peer comments on this answer (and responses from the answerer)
agree  Lisa Frideborg Eddy (X)
24 mins
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