Effect of Room Illuminance on Monitor Black Level Luminance and Monitor Calibration

Chakrabarti, K.; Kaczmarek, Ronald G.; Thomas, Jerry A.; Romanyukha, A.

doi:10.1007/s10278-003-1720-5

Cited by 31 publications

(17 citation statements)

References 12 publications

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“…This is also the case if no light other than that of the monitor is used. Ambient lighting was adjusted to ensure a reading on all monitors of between 25 and 40 lux, which is the level required to ensure maximum diagnostic accuracy when reporting on images (Chakrabarti et al, 2003;Brennan et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

Poor agreement between operators on grading of the placenta

Moran¹,

Ryan²,

Higgins

et al. 2011

Journal of Obstetrics and Gynaecology

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Section: Methodsmentioning

confidence: 99%

Poor agreement between operators on grading of the placenta

Moran¹,

Ryan²,

Higgins

et al. 2011

Journal of Obstetrics and Gynaecology

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“…12 Our facility was fortunate in being able to design a new department for primary soft-copy reading of images, so that we could build in the appropriate recessed lighting, dimmer controls, climate control, and furniture. Even so, this survey showed the locations where changes were needed.…”

Section: Discussionmentioning

confidence: 99%

Assessment of PACS Display Systems

Aldrich

Rutledge

2005

J Digit Imaging

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This work describes our experience in reviewing the performance criteria for display systems and how we have implemented a practical approach to the assessment of the workstation environment in a large tertiary care hospital. The acceptance criteria contained in the draft report of Topic Group 18 of the American Association of Physicists in Medicine (AAPM) were used as a basis for assessment of primary and secondary displays. A telescopic photometer was used to measure the maximum luminance and the contrast ratio of the image for the displays used in our radiology department and in the operating and emergency rooms using the standard Society of Motion Picture and Television Engineers (SMPTE) pattern, in ambient light and with light decreased as much as possible. About half of the displays met the AAPM criteria for minimum luminance and contrast ratio in low light. None of the systems met the contrast ratio criteria in ambient light. The challenges in improving the performance and calibrating displays are discussed.

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“…All monitors were calibrated to the GSDF (greyscale standard display function) standard to ensure equivalent brightness and contrast 7,10 . The room (ambient) lighting was adjusted to make certain of a reading on all monitors of between 25 and 40 lux which ensures maximum image contrast, necessary for diagnostic accuracy 11,12 . These controls guaranteed consistent observer perception of images for all five monitors, over both occasions.…”

Section: Grade IIImentioning

confidence: 99%

Is Grannum grading of the placenta reproducible?

et al. 2009

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Publication information7263 : W1-W6 ABSTRACTCurrent ultrasound assessment of placental calcification relies on Grannum grading. The aim of this study was to assess if this method is reproducible by measuring inter-and intra-observer variation in grading placental images, under strictly controlled viewing conditions. Thirty placental images were acquired and digitally saved. Five experienced sonographers independently graded the images on two separate occasions. In order to eliminate any technological factors which could affect data reliability and consistency all observers reviewed images at the same time. To optimise viewing conditions ambient lighting was maintained between 25-40 lux, with monitors calibrated to the GSDF standard to ensure consistent brightness and contrast. Kappa (κ) analysis of the grades assigned was used to measure inter-and intra-observer reliability. Intra-observer agreement had a moderate mean κ-value of 0.55, with individual comparisons ranging from 0.30 to 0.86. Two images saved from the same patient, during the same scan, were each graded as I, II and III by the same observer. A mean κ-value of 0.30 (range from 0.13 to 0.55) indicated fair inter-observer agreement over the two occasions and only one image was graded consistently the same by all five observers. The study findings confirmed the lack of reproducibility associated with Grannum grading of the placenta despite optimal viewing conditions and highlight the need for new methods of assessing placental health in order to improve neonatal outcomes. Alternative methods for quantifying placental calcification such as a software based technique and 3D ultrasound assessment need to be explored.

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Effect of Room Illuminance on Monitor Black Level Luminance and Monitor Calibration

Cited by 31 publications

References 12 publications

Poor agreement between operators on grading of the placenta

Poor agreement between operators on grading of the placenta

Assessment of PACS Display Systems

Is Grannum grading of the placenta reproducible?

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