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Radiographic Appearance of a Catheter-Free Wireless Esophageal pH Probe

Charles T. Lau1, Warren B. Gefter1 and David C. Metz2

1 Division of Thoracic Imaging, Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce St., 1 Silverstein, Philadelphia, PA 19104.
2 Division of Gastroenterology, Hospital of the University of Pennsylvania, Philadelphia, PA 19104.



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  		Fig. 1A. —54-year-old man with chest pain. Lateral chest radiograph reveals metallic object situated in retrocardiac region in middle mediastinum, probably within middle segment of esophagus.

 


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  		Fig. 1B. —54-year-old man with chest pain. Magnification of lateral chest radiograph reveals intricate metallic object with paired round objects at one end. A swallowed earring was initially suspected.

 


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  		Fig. 2. —Wireless pH probe. pH sensor, small circuit board, two disk batteries, retaining bar, and antenna are encapsulated inside object not much longer than the width of a penny.

 


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  		Fig. 3. —Endoscopic image within esophageal lumen. Wireless pH probe is attached to esophagus wall.

 


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  		Fig. 4A. —Wireless pH probe. Wireless pH probe mounted on its delivery device.

 


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  		Fig. 4B. —Wireless pH probe. Lateral fluoroscopic image of wireless pH probe mounted on its delivery device reveals appearance identical to object identified in lateral chest radiograph in Figs. 1A and 1B.

 


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  		Fig. 4C. —Wireless pH probe. Frontal fluoroscopic image of wireless pH probe mounted on its delivery device shows another appearance wireless probe may have on radiography.

 

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