Experimental studies of indentor misalignment for indentation test on soft tissues

Zheng, YP; Huang, Dongmei; Mak, Arthur F.T.

doi:10.1109/iembs.1997.758808

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…However, errors could have also been introduced due to the misalignment of the indenter. Studies conducted by Zheng et al(1997) show that a misalignment range of 0 to 12.5 degrees could lead to an approximate error of around 2% in thickness measurement for a similar setup. One of the other limitations of the current study is that the indentation rate was not constant due to complexities in measurement setup; however, based on the suggested range from previous studies (Xiong et al, 2011), care was taken that the indentation rate was less than 2mm/sec.…”

Section: Discussionmentioning

confidence: 99%

Measurement of soft tissue deformation at discomfort and pain threshold in different regions of the head

Shah

Luximon

Luximon³

2022

Ergonomics

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Understanding of product-soft tissue interface and related discomfort is essential while designing wearable devices. Although pressure thresholds at the perception of discomfort and pain have been measured in the past, associated tissue deformation are yet to be studied. This data can provide a holistic understanding of user discomfort and be a valuable reference for ergonomic product design. Hence, in the current study, tissue deformation at discomfort and pain threshold was measured using an ultrasound indentation device at eighteen landmarks for sixty Chinese adults on the head and face. Results show that deformation was higher in the facial region than the scalp and forehead, with maximum deformation in the cheek area and minimum in the forehead region for both thresholds. Also, for most landmarks, the tissue deformation data showed no significant relationship with age and Body Mass Index (BMI). Nearly half of the landmarks exhibited significant gender-based differences. Overall, the measured data showed acceptable within-session and between-session reliability.

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Section: Discussionmentioning

confidence: 99%

Measurement of soft tissue deformation at discomfort and pain threshold in different regions of the head

Shah

Luximon

Luximon³

2022

Ergonomics

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“…A previous numerical study using finite element analysis demonstrated that the stress distribution in the tissue upon indentation was significantly influenced by the misalignment, but the entire force transient of the indentation response was only slightly affected for up to 8 ' = of indentor misalignment (HUANG and MAK, 1994). A previous in vitro experiment on a fresh fish tissue layer demonstrated that the effect of indentor misalignment depended on the ratio of tissue thickness to indentor diameter, indentation responses were significantly influenced by the indentor misalignment at sites with soft tissue thickness comparable to the diameter of the indentor (ZHENG et al, 1997). At indentor misalignments up to 12.5 '=, the effect on the indentation response decreased as the tissue thickness increased, and became almost negligible when the thickness was greater than double the indentor diameter.…”

Section: Fig 3 Subject Being Tested Using the Ultrasotmd Palpation Pmentioning

confidence: 96%

Assessment of neck tissue fibrosis using an ultrasound palpation system: A feasibility study

Zheng

Leung

Mak

2000

Med. Biol. Eng. Comput.

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Fibrotic change in the soft tissue of the neck is a common side-effect after radiotherapy treatment for cancers of the head and neck region. The development of a quantitative approach for the assessment of neck tissue stiffness using an ultrasound palpation system (UPS) is reported. A testing protocol was established with the participation of eight normal subjects and four patients who had neck fibrosis after previous radiotherapy to the neck. Six reference sites were assessed on each side of the neck in each subject. Site-dependence, inter-observer variability, and intra-observer variability were further evaluated by measurement of sites 1 cm anterior, posterior, superior and inferior to two of the reference sites on each side of the neck, and by repeating measurements using a second observer on the same occasion and using the same observer one week afterwards. The mean tissue Young's modulus for normal subjects was 12.8 +/- 3.9 kPa, and that of the radiotherapy-treated patients ranged from 46.4 to 108.3 kPa. The modulus shows limited variation among anatomical sub-sites within the neck. For a confidence level of 95%, there was a variation of +/- 14.2% for site-dependence, +/- 15.2% for inter-observer, and +/- 7.2% for intra-observer tests for the group of normal subjects. The variation in the patients was +/- 13.6% for site-dependence, and +/- 13.1% for the inter-observer test.

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“…The first task was to find an object capable of making a reproducible imprint to a depth sufficient to cast a detectable shadow that could be easily analysed. The published work on indentation focuses almost entirely on circular indentors (10,25,(29)(30)(31)(32). However, a linear-shaped indentor was chosen based on the predictability of its effect on the tissue and ease of alignment.…”

Section: Designmentioning

confidence: 99%

A new device for assessing changes in skin viscoelasticity using indentation and optical measurement

Clancy

Nilsson

Anderson

et al. 2010

Skin Research and Technology

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Experimental studies of indentor misalignment for indentation test on soft tissues

Cited by 4 publications

References 12 publications

Measurement of soft tissue deformation at discomfort and pain threshold in different regions of the head

Measurement of soft tissue deformation at discomfort and pain threshold in different regions of the head

Assessment of neck tissue fibrosis using an ultrasound palpation system: A feasibility study

A new device for assessing changes in skin viscoelasticity using indentation and optical measurement

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