(n.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle.
Example Sentences:
(1) Therefore, the paths of the individual mandibular points are epicycloids or hypocycloids.
Hypocycloid
Definition:
(n.) A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf. Epicycloid, and Trochoid.
Example Sentences:
(1) Axial hypocycloidal tomography is now an indispensable part of the diagnostic evaluation of patients with suspected orbital tumours and the procedure is complementary to other non-invasive investigations of the orbit, such as axial computerized tomography and ultrasonography.
(2) Six examiners, three radiologists and three oral surgeons, independently measured the distance from the alveolar crest to the upper border of the mandibular canal in transverse hypocycloidal tomograms of the mandible.
(3) The requirements for reproduction on thin bony walls at tomography with hypocycloidal movement are defined and discussed.
(4) Thirty-six temporomandibular joints (TMJs) in 28 symptomatic patients (aged 14-40 years) with rheumatic disease (mostly rheumatoid arthritis) were studied with magnetic resonance (MR) imaging and hypocycloidal tomography.
(5) The hypocycloidal polytomographic temporal bone studies performed on 2683 patients were reviewed, and the radiographic appearance of the vestibular aqueduct was evaluated.
(6) Hypocycloidal (frontal and temporal) tomography of the base of the skull is compared with high resolution computed tomography (HR-CT) with respect to dose and clinical usefulness.
(7) For preliminary evaluation of the temporal bone, a combination of conventional radiographs and hypocycloidal tomography in the frontal projection is advocated.
(8) Hypocycloidal images of a head phantom were subjectively ranked for image quality, and contrast, spatial frequency spectra, and Wiener noise spectra were measured.
(9) Previous reports have described the use of metrizamide cisternography combined with either hypocycloidal tomography or computerized tomography; however, direct, dynamic, real-time visualization of the fistula is difficult with instillation of a minimal dose of metrizamide using those methods.
(10) The techniques described include simple plain film roentgenography (and its contrast-related applications: dacryocystography, orbital venography, and angiography), axial hypocycloidal tomography, computed tomography, ultrasonography, and magnetic resonance imaging.
(11) Fractures are best evaluated by conventional roentgenograms with linear or hypocycloidal tomography.
(12) In the second group, the preoperative endoscopic findings were dominated by disease in the middle meatus and in the area of the anterior ethmoid, verified either by conventional hypocycloidal or computed tomography.
(13) Modulation Transfer Functions (MTF) for tomographic imaging with linear, circular, hypocycloidal and spiral motion are given.
(14) The EMI-Scanner had a diagnostic accuracy of 84%; orbital venography, 84%; axial hypocycloidal tomography, 71%; and ultrasound, 76%.
(15) With exception of one woman in whom it probably had been missed by hypocycloidal tomography, no demonstrable prolactinoma developed.
(16) This paper presents a technique for accurate localization of these fistulae, using metrizamide cisternography combined with both hypocycloidal tomography and computed tomography.
(17) The following radiographic techniques were used: periapical and panoramic radiography, hypocycloidal tomography, and computed tomography (CT).
(18) Pneumoencephalography with hypocycloidal polytomography is interpreted as both an empty sella, and evidence of a pituitary adenoma.
(19) Cisternography with metrizamide (Amipaque) and hypocycloidal tomography was found to depict cisternal anatomy with detail and precision not obtainable with any other technique.
(20) Each patient had a combined tomographic examination consisting of 15 degrees linear movement followed by 34 degrees hypocycloidal movement.