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Using Edge Enhancement to Identify Subtle Findings on Soft-Copy Neonatal Chest Radiographs

Hyun Woo Goo1, Hyun Jin Kim1, Koun-Sik Song1, Ellen Ai-Rhan Kim2, Ki Soo Kim2, Chong Hyun Yoon1 and Soo Young Pi2

1 Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-dong, Songpa-gu, Seoul, 138-736, Korea.
2 Department of Neonatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 138-736, Korea.



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  		Fig. 1. —Drawing shows strong edge-enhancing mode in PACS. Added filter transforms rectangular region-of-source pixel values by multiplying each pixel value by a constant and then adding results. Thereafter, filter divides resulting sum by divisor, and result is adjusted to range of gray scale.

 


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  		Fig. 2A. —1-day-old male neonate with right pneumothorax. Unprocessed soft copy of anteroposterior chest radiograph fails to show residual right-sided pneumothorax (arrows) clearly.

 


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  		Fig. 2B. —1-day-old male neonate with right pneumothorax. Edge-enhanced soft copy of anteroposterior radiograph of chest shows sharp pleural line (arrows). Diagnosis of small right-sided pneumothorax can be made with confidence. (Observers viewed images of entire chest; image has been cropped for publication only.)

 


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  		Fig. 2C. —1-day-old male neonate with right pneumothorax. Left lateral decubitus radiograph of chest obtained later same day shows confirmatory evidence of right-sided pneumothorax (arrows).

 


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  		Fig. 3A. —2-week-old female neonate with left central venous catheter. Unprocessed soft copy of chest radiograph does not show placement of left central venous catheter clearly.

 


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  		Fig. 3B. —2-week-old female neonate with left central venous catheter. Edge-enhanced soft copy of chest radiograph clearly shows malpositioned catheter in left neck vein (arrows). By identifying misplacement of catheter, radiologist can ensure that appropriate clinical action, such as removal or repositioning of catheter, is taken.

 

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