[Oradlist] Cervical Burnout and Mach Band effect in IOdigital Radiographs

[Sanjay Mallya]

The phenomenon of the Mach Band effect is due to lateral inhibition in  
the retina. However, the perception of this illusion is influenced by  
contrast, (and also  by the contour of the object as well) and so yes,  
it is possible that one imaging system may accentuate/decrease this  
illusion. Here is a link to an excellent article on this:

http://radiology.rsnajnls.org/cgi/content/full/219/3/596

On Feb 26, 2009, at 3:28 PM, Allan G Farman wrote:

> Anything that can affect contrast can affect the illusion of the  
> Mach effect... so I humbly differ from this reply. Allan
>
> Allan G. Farman, BDS, PhD, MBA, DSc, Diplomate ABOMR
>
> Prof. Radiology & Imaging Science
> Univ. Louisville School of Dentistry: SUHD
> 501 South Preston Street,
> Louisville, Kentucky 40292, USA
>
> Tel: +1(502) 852.1241
> Fax: +1(502)852.1626
>
>
>>>> "Ruprecht, Axel" <axel-ruprecht at uiowa.edu> 2/26/2009 10:33 AM >>>
> Mach band has nothing to do with the imaging system, It is a lateral  
> inhibition effect in your eye/brain. I believe that Ernie Lam had  
> found an interesting paper on this a few years ago.  Ernie?
>
> Rgds
> [cid:image001.jpg at 01C997F5.5972B080]
>
>
>
> From: oradlist-bounces at lists.ucla.edu [mailto:oradlist-bounces at lists.ucla.edu 
> ] On Behalf Of Kaustubh Sansare
> Sent: Wednesday, February 25, 2009 11:31 PM
> To: oradlist at lists.ucla.edu
> Subject: [Oradlist] Cervical Burnout and Mach Band effect in IO  
> digital Radiographs
>
>
> Hi Everybody,
>
> We are in the process of embarking on a project on Cervical Burnout  
> and Mach Band effect in IntraOral digital Radiographs. Before we  
> start we thought of floating the idea on this forum. Does anybody  
> have any experience on this topic? Should Cervical Burnout and Mach  
> Band efeect be seen on IntraOral digital Radiographs, any  
> explanations for your views?
>
> Cervical burnout being a anatomic phenomenon and Mach band effect a  
> optical illusion should remain unchanged be it analog or digital  
> radiograph- is our take.
>
> Thanks
> Dr. Kaustubh Sansare,
> Associate Professor,
> Oral and Maxillofacial Radiology,
> Nair Hospital Dental College,
> Mumbai,
> India.
>
>
>
>
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