ABSTRACT
Contrast-enhanced mammography is being increasingly implemented clinically, providing much improved contrast between tumour and background structures, particularly in dense breasts. Although CEM is similar to conventional mammography it differs via an additional exposure with high energy X-rays (≥ 40 kVp) and subsequent image subtraction. Because of its special operational aspects, the CEM aspect of a CEM unit needs to be uniquely characterised and evaluated. This study aims to verify the utility of a commercially available phantom set (BR3D model 020 and CESM model 022 phantoms (CIRS, Norfolk, Virginia, USA)) in performing key CEM performance tests (linearity of system response with iodine concentration and background subtraction) on two models of CEM units in a clinical setting. The tests were successfully performed, yielding results similar to previously published studies. Further, similarities and differences in the two systems from different vendors were highlighted, knowledge of which may potentially facilitate optimisation of the systems.
ABSTRACT
Adolescents with a chronic illness or physical disability have a more difficult time separating from parents, achieving a sense of mastery, developing social skills among peers, and achieving a positive body-image than do able-bodied adolescents. To promote attainment of these developmental tasks, Adventure, Etc. was created as a wilderness/urban Outward Bound experience for chronically ill, physically disabled, and able-bodied teens. Pre- and posttesting and interviewing assessed locus of control, self-image, family environment, and family dynamics. Over a two-year period, 37 teens completed the program and were tested; 23 were chronically ill or disabled. The chronically ill/disabled group showed a significant increase in internal locus of control. No change was found in the able-bodied group. Both the able-bodied and the disabled/chronically ill groups showed a significant improvement in body image. Reported family conflict declined, as did family recreational involvement, while individual recreational activities among these adolescents increased. Based on these results, new follow-up activities for the parents and adolescents were initiated to further the gains of program participants.
