The effect of compression on confidence during the detection of skull fractures in CT

Ines Nikolovski; Mark F. McEntee; Roger Bourne; Mariusz W. Pietrzyk; Evanoff E. Micheal; Brennan B. Patrick; Tay Kevin

doi:10.1117/12.913748

The effect of compression on confidence during the detection of skull fractures in CT

Ines Nikolovski
, Mark F. McEntee
, Roger Bourne
, Mariusz W. Pietrzyk
, Evanoff E. Micheal
, Brennan B. Patrick
, Tay Kevin

Research output: Chapter in Book/Report/Conference proceedings › Conference proceeding › peer-review

Abstract

As part of a study to establish whether detection of cranial vault fractures is affected by JPEG 2000 30:1 and 60:1 lossy compression when compared to JPEG 2000 lossless compression we looked at the effects on confidence ratings 55 CT images, with three levels of JPEG 2000 compression (lossless, 30:1 & 60:1) were presented to 14 senior radiologists, 12 from the American Board of Radiology and 2 form Australia, 7 of whom were MSK specialists and 7 were neuroradiologists. 32 Images contained a single skull fracture while 23 were normal. Images were displayed on one calibrated, secondary LCD, in an ambient lighting of 32.2 lux. Observers were asked to identify the presence or absence of a fracture and where a fracture was present to locate and rate their confidence in its presence. A jack-knifed alternate free-response receiver operating characteristic (JAFROC) and a ROC methodology was employed and the DBM MRMC and ANOVA were used to explore differences between the lossless and lossy compressed images. A significant trend of increased confidence in true and false positive scores was seen with JPEG2000 Lossy 60:1 compression. An ANOVA on the mean confidence rating obtained for correct (TP) and incorrect (FP) localization skull fractions demonstrated that this was a significant difference between lossless and 60:1 [FP, p<0.001; TP, p<0.014] and 30:1 and 60:1 [FP, p<0.014; TP, p<0.037].

Original language	English
Title of host publication	Medical Imaging 2012
Subtitle of host publication	Image Perception, Observer Performance, and Technology Assessment
Editors	Craig K. Abbey, Claudia R. Mello-Thoms
Publisher	SPIE
ISBN (Electronic)	9780819489678
DOIs	https://doi.org/10.1117/12.913748
Publication status	Published - 2012
Externally published	Yes
Event	Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment - San Diego, United States Duration: 8 Feb 2012 → 9 Feb 2012

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	8318
ISSN (Print)	1605-7422

Conference

Conference	Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment
Country/Territory	United States
City	San Diego
Period	8/02/12 → 9/02/12

Keywords

Confidence ratings
CT skull fractures
JPEG 2000 Lossy compression

Access to Document

10.1117/12.913748

Cite this

Nikolovski, I., McEntee, M. F., Bourne, R., Pietrzyk, M. W., Micheal, E. E., Patrick, B. B., & Kevin, T. (2012). The effect of compression on confidence during the detection of skull fractures in CT. In C. K. Abbey, & C. R. Mello-Thoms (Eds.), Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment Article 83181O (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8318). SPIE. https://doi.org/10.1117/12.913748

@inproceedings{e837b73ece60408da24f97957dee8b9f,

title = "The effect of compression on confidence during the detection of skull fractures in CT",

abstract = "As part of a study to establish whether detection of cranial vault fractures is affected by JPEG 2000 30:1 and 60:1 lossy compression when compared to JPEG 2000 lossless compression we looked at the effects on confidence ratings 55 CT images, with three levels of JPEG 2000 compression (lossless, 30:1 \& 60:1) were presented to 14 senior radiologists, 12 from the American Board of Radiology and 2 form Australia, 7 of whom were MSK specialists and 7 were neuroradiologists. 32 Images contained a single skull fracture while 23 were normal. Images were displayed on one calibrated, secondary LCD, in an ambient lighting of 32.2 lux. Observers were asked to identify the presence or absence of a fracture and where a fracture was present to locate and rate their confidence in its presence. A jack-knifed alternate free-response receiver operating characteristic (JAFROC) and a ROC methodology was employed and the DBM MRMC and ANOVA were used to explore differences between the lossless and lossy compressed images. A significant trend of increased confidence in true and false positive scores was seen with JPEG2000 Lossy 60:1 compression. An ANOVA on the mean confidence rating obtained for correct (TP) and incorrect (FP) localization skull fractions demonstrated that this was a significant difference between lossless and 60:1 [FP, p<0.001; TP, p<0.014] and 30:1 and 60:1 [FP, p<0.014; TP, p<0.037].",

keywords = "Confidence ratings, CT skull fractures, JPEG 2000 Lossy compression",

author = "Ines Nikolovski and McEntee, \{Mark F.\} and Roger Bourne and Pietrzyk, \{Mariusz W.\} and Micheal, \{Evanoff E.\} and Patrick, \{Brennan B.\} and Tay Kevin",

note = "Publisher Copyright: {\textcopyright} 2012 SPIE.; Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment ; Conference date: 08-02-2012 Through 09-02-2012",

year = "2012",

doi = "10.1117/12.913748",

language = "English",

series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

publisher = "SPIE",

editor = "Abbey, \{Craig K.\} and Mello-Thoms, \{Claudia R.\}",

booktitle = "Medical Imaging 2012",

address = "United States",

}

Nikolovski, I, McEntee, MF, Bourne, R, Pietrzyk, MW, Micheal, EE, Patrick, BB & Kevin, T 2012, The effect of compression on confidence during the detection of skull fractures in CT. in CK Abbey & CR Mello-Thoms (eds), Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment., 83181O, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 8318, SPIE, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment, San Diego, United States, 8/02/12. https://doi.org/10.1117/12.913748

The effect of compression on confidence during the detection of skull fractures in CT. / Nikolovski, Ines; McEntee, Mark F.; Bourne, Roger et al.
Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment. ed. / Craig K. Abbey; Claudia R. Mello-Thoms. SPIE, 2012. 83181O (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8318).

Research output: Chapter in Book/Report/Conference proceedings › Conference proceeding › peer-review

TY - GEN

T1 - The effect of compression on confidence during the detection of skull fractures in CT

AU - Nikolovski, Ines

AU - McEntee, Mark F.

AU - Bourne, Roger

AU - Pietrzyk, Mariusz W.

AU - Micheal, Evanoff E.

AU - Patrick, Brennan B.

AU - Kevin, Tay

PY - 2012

Y1 - 2012

N2 - As part of a study to establish whether detection of cranial vault fractures is affected by JPEG 2000 30:1 and 60:1 lossy compression when compared to JPEG 2000 lossless compression we looked at the effects on confidence ratings 55 CT images, with three levels of JPEG 2000 compression (lossless, 30:1 & 60:1) were presented to 14 senior radiologists, 12 from the American Board of Radiology and 2 form Australia, 7 of whom were MSK specialists and 7 were neuroradiologists. 32 Images contained a single skull fracture while 23 were normal. Images were displayed on one calibrated, secondary LCD, in an ambient lighting of 32.2 lux. Observers were asked to identify the presence or absence of a fracture and where a fracture was present to locate and rate their confidence in its presence. A jack-knifed alternate free-response receiver operating characteristic (JAFROC) and a ROC methodology was employed and the DBM MRMC and ANOVA were used to explore differences between the lossless and lossy compressed images. A significant trend of increased confidence in true and false positive scores was seen with JPEG2000 Lossy 60:1 compression. An ANOVA on the mean confidence rating obtained for correct (TP) and incorrect (FP) localization skull fractions demonstrated that this was a significant difference between lossless and 60:1 [FP, p<0.001; TP, p<0.014] and 30:1 and 60:1 [FP, p<0.014; TP, p<0.037].

AB - As part of a study to establish whether detection of cranial vault fractures is affected by JPEG 2000 30:1 and 60:1 lossy compression when compared to JPEG 2000 lossless compression we looked at the effects on confidence ratings 55 CT images, with three levels of JPEG 2000 compression (lossless, 30:1 & 60:1) were presented to 14 senior radiologists, 12 from the American Board of Radiology and 2 form Australia, 7 of whom were MSK specialists and 7 were neuroradiologists. 32 Images contained a single skull fracture while 23 were normal. Images were displayed on one calibrated, secondary LCD, in an ambient lighting of 32.2 lux. Observers were asked to identify the presence or absence of a fracture and where a fracture was present to locate and rate their confidence in its presence. A jack-knifed alternate free-response receiver operating characteristic (JAFROC) and a ROC methodology was employed and the DBM MRMC and ANOVA were used to explore differences between the lossless and lossy compressed images. A significant trend of increased confidence in true and false positive scores was seen with JPEG2000 Lossy 60:1 compression. An ANOVA on the mean confidence rating obtained for correct (TP) and incorrect (FP) localization skull fractions demonstrated that this was a significant difference between lossless and 60:1 [FP, p<0.001; TP, p<0.014] and 30:1 and 60:1 [FP, p<0.014; TP, p<0.037].

KW - Confidence ratings

KW - CT skull fractures

KW - JPEG 2000 Lossy compression

UR - https://www.scopus.com/pages/publications/84877356420

U2 - 10.1117/12.913748

DO - 10.1117/12.913748

M3 - Conference proceeding

AN - SCOPUS:84877356420

T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

BT - Medical Imaging 2012

A2 - Abbey, Craig K.

A2 - Mello-Thoms, Claudia R.

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ER -

Nikolovski I, McEntee MF, Bourne R, Pietrzyk MW, Micheal EE, Patrick BB et al. The effect of compression on confidence during the detection of skull fractures in CT. In Abbey CK, Mello-Thoms CR, editors, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment. SPIE. 2012. 83181O. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). doi: 10.1117/12.913748

The effect of compression on confidence during the detection of skull fractures in CT

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