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D J Dickey

Publications and source records attributed to D J Dickey.

4 recordsLinked to original sources
PubMed2001

Light dosimetry using the P3 approximation.

In earlier work, we demonstrated that radiance, calculated using the P3 approximation in a plane wave geometry, could be used to accurately predict the optical parameters of an Intralipid/methylene blue phantom. Plane wave geometry is impractical for clinical use but the results of this work encouraged us to further develop the P3 approximation for a spherical geometry, described in this paper. Radiance predicted by this model for a defined Intralipid/methylene blue phantom was compared with radiance measured in this phantom. The results demonstrate that the spherical derivation of the P3 approximation will reproducibly predict optical parameters of a tissue phantom as effectively as the slab geometry derivation of the P3 approximation. In a similar protocol, the P3 approximation was used to estimate the optical parameters of ex vivo human prostate. Radiance in this case was measured in the prostate samples using an after loading technique. Three prostate samples tested were found to be surprisingly optically homogeneous. The after loading protocol described in this paper could form the basis of a minimally invasive and effective clinical method to optically characterize human prostate.

Humans↗
PubMed1997

Presentation and management of childhood psychosocial problems.

BACKGROUND: Between 15% and 25% of children who visit primary care physicians have emotional, behavioral, or psychiatric problems that affect their functioning. The majority of these children are treated by primary care physicians. The purpose of this study was to examine the presentation and treatment of children's psychosocial problems in primary care and to investigate ways in which physician management of a problem is related to parent-physician agreement that the problem exists. METHODS: Twenty-six physicians at an ambulatory care center of a community-based, university-affiliated family medicine training program collected data during outpatient visits of 898 children aged 2 to 16 years. The physicians used a checklist to collect data on children's developmental problems, parents' concerns about the psychosocial functioning of their children, whether physicians and parents were in agreement about these concerns, and the parents' influence on physicians' management of the problems. RESULTS: Family physicians and parents agreed that 10% of the children were experiencing psychosocial problems. For 5% of children, physicians recorded emotional or behavioral concerns when parents did not disclose any such concerns. For only 1.8% of children, parents raised psychosocial concerns while physicians did not. Physicians diagnosed and managed psychosocial concerns during both acute-care and well-child visits. When parents and physicians agreed on the presence of pediatric psychosocial problems, referral to a mental health professional was more likely than when they disagreed (60% vs 16%). CONCLUSIONS: Pediatric psychosocial concerns are raised by parents during acute-care and well-child visits. Family physicians identified and managed these problems at rates consistent with past research. Management strategies appeared to differ as a function of agreement between physicians and parents on whether a problem existed.

Adolescent↗