This paper describes the design and development of a calibration phantom to be used to aid in the calculation of the temporal resolution of tomographic imaging devices. Current practice for characterizing the dynamic response of a tomographic imaging device, such as a computed tomography or magnetic resonance imaging machine, uses image acquisition time as a surrogate for temporal resolution. At present, no standard method for describing the temporal resolution of a tomographic imaging device exists. Similar to the spatial modulation transfer function (MTF) used for characterizing spatial resolution, the concept of temporal MTF (t-MTF) can be used to enable characterization of temporal resolution. A scanner’s t-MTF represents the percentage amplitude modulation transfer in the image as a function of the input frequency. The calibration phantom uses slotted disks, each mounted to the rotating ring gear of a planetary gear assembly. The sun gears of each planetary gear set are driven from a common shaft to create differential speed sectors, allowing for about two decades of input frequencies to be obtained using a single motor and driveshaft. Preliminary results show a monotonic decline in the modulation transfer as the input frequency is increased. As expected, there is more modulation transfer at lower frequency and less modulation transfer at high frequency. Analogous to the spatial resolution, one can define the frequency for which there is 10% modulation transfer as the temporal resolution of a scanner.
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September 2007
Design Innovation Paper
Design of a Calibration Phantom for Measuring the Temporal Resolution of a Tomographic Imaging Device
Alexander H. Slocum, Jr.,
Alexander H. Slocum, Jr.
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114
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Stephen E. Jones,
Stephen E. Jones
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114
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Rajiv Gupta
Rajiv Gupta
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114
Search for other works by this author on:
Alexander H. Slocum, Jr.
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114
Stephen E. Jones
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114
Rajiv Gupta
Department of Mechanical Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139; Department of Radiology, Massachusetts General Hospital, Boston, MA 02114J. Med. Devices. Sep 2007, 1(3): 225-232 (8 pages)
Published Online: August 13, 2007
Article history
Received:
May 15, 2007
Revised:
August 13, 2007
Citation
Slocum, A. H., Jr., Jones, S. E., and Gupta, R. (August 13, 2007). "Design of a Calibration Phantom for Measuring the Temporal Resolution of a Tomographic Imaging Device." ASME. J. Med. Devices. September 2007; 1(3): 225–232. https://doi.org/10.1115/1.2785189
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