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Biomedical subjects

D R Pickens

Publications and source records attributed to D R Pickens.

31 records · Page 2Linked to original sources
PubMed1980

Operative cholangiography. Review of 7,529 operations on the biliary tree in a community hospital.

Primary operation for cholelithiasis ranks third in frequency among general surgical procedures performed in this country each year [16]. The mortality and morbidity associated with retained common duct stones are apparent to all biliary surgeons. Although operative cholangiography is a standard procedure in many centers, some still use this adjunct to biliary surgery infrequently, as shown by the 51 percent performance rate in the present study. However, the literature is replete with evidence supporting the routine use of cholangiography. In the present report positive findings on common duct exploration almost doubled when operative cholangiography was added to the clinical and operative criteria for common duct exploration. Our experience indicates that common duct exploration is not always required when the patient has jaundice if normal operative cholangiograms support the patient's history and other laboratory findings. Cholangiography was also found to be accurate in the five cases in which a secondary biliary procedure had to be performed.

Cholangiography↗
PubMed1978

Pilonidal cyst: an operative approach.

An operative technic is presented which has been used on fifty-four patients with pilonidal cyst. This technic has resulted in primary union and complete healing within six weeks in 89 per cent of cases. The use of an incision that crosses the vertical gluteal fold at an angle and eliminates the suture line in the gluteal fold has been beneficial in all patients on whom it was used.

Humans↗
PubMedDate not supplied

Digital image motion correction by spatial warp methods.

A technique for correction of motion between images which are obtained in high-speed digital subtraction or cine angiographic acquisitions is being tested. The method is based on the application of quadratic polynomial equations which transform one image so that it matches a reference image. Images which have been processed in this manner can be summed to improve the signal-to-noise ratios over individual images. The technique for motion correction currently being tested uses operator interaction to establish the appropriate polynomial transformation. An operator selects fiducial (reference) points on an image which will be the reference. Then he selects the corresponding fiducial points on the image to be processed. The algorithm calculates the coefficients of a pair of quadratic polynomial equations and applies them to each pixel in the image. Results demonstrate the application of the technique in phantoms and in digitized cine angiograms.

Angiography↗