Michael Hanley

Publications of Michael Hanley

• Current contrast media delivery strategies for cardiac and pulmonary multidetector-row computed tomography angiography.

  Authors: Luis R Ramos-Duran, John F Kalafut, Michael Hanley, U Joseph Schoepf

  Journal of thoracic imaging. 11/2010; 25(4):270-7.

  Recent advances in multidetector-row computed tomography (MDCT) have led to substantial improvements in coverage area, acquisition speed, and temporal/spatial resolution, which have strengthened theRecent advances in multidetector-row computed tomography (MDCT) have led to substantial improvements in coverage area, acquisition speed, and temporal/spatial resolution, which have strengthened the performance of thoracic and cardiac MDCT angiography but have also imposed new challenges for optimization of contrast medium enhancement and scan acquisition strategies. Understanding contrast media dynamics is fundamental for the design of scan acquisition and injection protocols. This article examines the fundamentals of the physiological and contrast delivery factors that determine the quality of contrast enhancement, emphasizing the modifications required in contrast delivery protocols for optimizing cardiothoracic MDCT angiography with modern-era MDCT scanners.

• Practical strategies for low radiation dose cardiac computed tomography.

  Authors: Thomas Henzler, Michael Hanley, Elisabeth Arnoldi, Gorka Bastarrika, U Joseph Schoepf, Hans-Christoph Becker

  Journal of thoracic imaging. 08/2010; 25(3):213-20.

  Concerns have been raised regarding the increasing radiation exposure associated with cardiac computed tomography (CT). Traditional cardiac CT imaging techniques comprise simultaneous recording ofConcerns have been raised regarding the increasing radiation exposure associated with cardiac computed tomography (CT). Traditional cardiac CT imaging techniques comprise simultaneous recording of the electrocardiogram signal combined with continuous slow-pitch spiral/helical scan acquisition with a relatively high incident radiation dose. Because of the increasing number of cardiac CT studies and further anticipated growth, the contribution of cardiac CT to radiation exposure of the population is not negligible. With growing radiation dose awareness, a variety of strategies have been developed aimed at improving the dose efficiency of electrocardiogram-synchronized cardiac CT acquisition techniques. Recent innovations have demonstrated that the radiation dose at cardiac CT can be substantially reduced without detrimental effects on diagnostic image quality. This study reviews currently available strategies for successfully reducing radiation dose in cardiac CT.

• Posterior occipitocervical (C0-3) fusion using polyaxial occipital condyle to cervical spine screw and rod fixation: a radiographic and cadaveric analysis.

  Authors: Bruce M Frankel, Michael Hanley, Alex Vandergrift, Timothy Monroe, Steven Morgan, Zoran Rumboldt

  Journal of neurosurgery. Spine. 05/2010; 12(5):509-16.

  Numerous conditions affect the occipitocervical junction requiring treatment with occipitocervical fixation. In this paper the authors present their technique of craniocervical fixation achieved withNumerous conditions affect the occipitocervical junction requiring treatment with occipitocervical fixation. In this paper the authors present their technique of craniocervical fixation achieved with the cephalad extension of posterior C1-3 polyaxial screw and rods to polyaxial screws placed in the occipital condyles. They retrospectively analyzed occipital condyle morphology obtained from CT analyses of 40 patients with normal cervical spines, evaluated occipital condyle screw placement feasibility in 4 cadavers, and provided a case report of a 70-year-old woman with rheumatoid arthritis, basilar invagination, and atlantoaxial instability who was treated with this novel technique. Based on radiographic analysis of occipital condyle anatomy, they concluded that on average a 3.5-mm-diameter x 20- to 30-mm-long screw can be safely placed at an angle of 20-33 degrees from the sagittal plane. Overall, measuring the condylar heights (mean [+/- SD] 10.8 +/- 1.5 mm, range 8.1-15.0 mm), widths (mean 11.1 +/- 1.4 mm, range 8.5-14.2 mm), lengths (20.3 +/- 2.1 mm, range 15.4-24.6 mm), and angles (mean 32.8 +/- 5.2 degrees , range 20.2-45.8 degrees) by using CT studies is an accurate and precise method. This finding correlates with the results of prior anatomical studies of occipital condyles and is important in the planning of craniovertebral junction surgery.

• Dacryocystitis: diagnosis and initial management in pediatric emergency medicine.

  Authors: James Kiger, Michael Hanley, Joseph D Losek

  Pediatric emergency care. 10/2009; 25(10):667-9.

  Complications of dacryocystoceles can be life-threatening in neonates. Dacryocystitis is a common complication of dacryocystoceles. The following case report illustrates the clinical characteristicsComplications of dacryocystoceles can be life-threatening in neonates. Dacryocystitis is a common complication of dacryocystoceles. The following case report illustrates the clinical characteristics of dacryocystitis in a 4-day-old infant. The pathophysiology, associated anatomical abnormalities, differential diagnosis, complications, and management of dacryocystoceles are reviewed.

• www.X-rayRisk.com: an online calculator for cancer risk.

  Authors: Michael Hanley, James D Koonce, Marques L Bradshaw

  Journal of the American College of Radiology : JACR. 08/2009; 6(7):475-6.

• Integrative computed tomographic imaging of cardiac structure, function, perfusion, and viability.

  Authors: Christian Thilo, Michael Hanley, Gorka Bastarrika, Balazs Ruzsics, U Joseph Schoepf

  Cardiology in review. 18(5):219-29.

  Recent advances in multidetector-row computed tomography (MDCT) technology have created new opportunities in cardiac imaging and provided new insights into a variety of disease states. Use ofRecent advances in multidetector-row computed tomography (MDCT) technology have created new opportunities in cardiac imaging and provided new insights into a variety of disease states. Use of 64-slice coronary computed tomography angiography has been validated for the evaluation of clinically relevant coronary artery stenosis with high negative predictive values for ruling out significant obstructive disease. This technology has also advanced the care of patients with acute chest pain by simultaneous assessment of acute coronary syndrome, pulmonary embolism, and acute aortic syndrome ("triple rule out"). Although MDCT has been instrumental in the advancement of cardiac imaging, there are still limitations in patients with high or irregular heart rates. Newer MDCT scanner generations hold promise to improve some of these limitations for noninvasive cardiac imaging. The evaluation of coronary artery stenosis remains the primary clinical indication for cardiac computed tomography angiography. However, the use of MDCT for simultaneous assessment of coronary artery stenosis, atherosclerotic plaque formation, ventricular function, myocardial perfusion, and viability with a single modality is under intense investigation. Recent technical developments hold promise for accomplishing this goal and establishing MDCT as a comprehensive stand-alone test for integrative imaging of coronary heart disease.