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Biomedical subjects

G D Guttmann

Publications and source records attributed to G D Guttmann.

3 recordsLinked to original sources

Animating functional anatomy for the web.

The instructor sometimes has a complex task in explaining the concepts of functional anatomy and embryology to health professional students. However, animations can easily illustrate functional anatomy, clinical procedures, or the developing embryo. Web animation increases the accessibility of this information and makes it much more useful for independent student learning. A modified version of the animation can also be used for patient education. This article defines animation, provides a brief history of animation, discusses the principles of animation, illustrates and evaluates some of the video-editing or movie-making computer software programs, and shows examples of two of the author's animations. These two animations are the inferior alveolar nerve block from the mandibular nerve anesthetics unit and normal temporomandibular joint (TMJ) function from the muscles of the mastication and the TMJ function unit. The software discussed are the industry leaders and have made the job of producing computer-based animations much easier. The programs are Adobe Premiere, Adobe After Effects, Apple QuickTime and Macromedia Flash .

Anatomy↗

Spilling the beans on java 3D: a tool for the virtual anatomist.

The computing world has just provided the anatomist with another tool: Java 3D, within the Java 2 platform. On December 9, 1998, Sun Microsystems released Java 2. Java 3D classes are now included in the jar (Java Archive) archives of the extensions directory of Java 2. Java 3D is also a part of the Java Media Suite of APIs (Application Programming Interfaces). But what is Java? How does Java 3D work? How do you view Java 3D objects? A brief introduction to the concepts of Java and object-oriented programming is provided. Also, there is a short description of the tools of Java 3D and of the Java 3D viewer. Thus, the virtual anatomist has another set of computer tools to use for modeling various aspects of anatomy, such as embryological development. Also, the virtual anatomist will be able to assist the surgeon with virtual surgery using the tools found in Java 3D. Java 3D will be able to fulfill gaps, such as the lack of platform independence, interactivity, and manipulability of 3D images, currently existing in many anatomical computer-aided learning programs.

Anatomy↗

The effect of fat on the coherent-to-Compton scattering ratio in the calcaneus: a computational analysis.

The coherent-to-Compton scattering ratio (CCSR) is a technique that has been proposed for measuring trabecular bone mineral density (TBMD). This paper investigates the effect of fat on the CCSR and its correlation to the error in TBMD measurements. It is a computational study to determine the relationship between the magnitude of fat error and the momentum-transfer variable chi, which represents the incident photon energy and the scattering angle. Variation in fat content contributes significantly to the error in CCSR measurements. When employing a typical 241Am source (E gamma = 59.45 keV), the resulting error decreases with increasing momentum-transfer variable or angle. For example, the error ranges from +14 mg/cc at an angle of 45 degrees (chi = 18.3) to +3 mg/cc at an angle of 135 degrees (chi = 44.3) for an osteoporotic trabecular region (100 mg/cc mineral) of a calcaneus that contains 6% less fat than a calibration standard. The error is about 0.3-1.2 mg/cc less for regions containing 2-3X more bone mineral and is reduced and opposite in sign for regions containing about 7% more fat than the calibration standards (e.g., -9 mg/cc at 45 degrees and -1.5 mg/cc at 135 degrees). Others have shown that the intrinsic sensitivity of the CCSR method for measuring TBMD at a given photon energy generally increases with increasing detector angle. Thus large angles are advantageous both for reduced sensitivity to fat variation and increased sensitivity to bone mineral variation. The primary disadvantage is reduced count rates that degrade precision unless long counting lines are employed.(ABSTRACT TRUNCATED AT 250 WORDS)

Absorptiometry, Photon↗