University of Massachusetts Medical School Faculty Publications

Title

Impact of respiratory motion on the detection of small pulmonary nodules in SPECT imaging

UMMS Affiliation

Department of Radiology, Division of Nuclear Medicine

Publication Date

2007-10-26

Document Type

Conference Proceeding

Disciplines

Analytical, Diagnostic and Therapeutic Techniques and Equipment | Bioimaging and Biomedical Optics | Biological and Chemical Physics | Nuclear | Nuclear Engineering | Radiology

Abstract

The objective of this investigation is to determine the impact of respiratory motion on the detection of small solitary pulmonary nodules (SPN) in single photon emission computed tomographic (SPECT) imaging. We have previously modeled the respiratory motion of SPN based on the change of location of anatomic structures within the lungs identified on breath-held CT images of volunteers acquired at two different stages of respiration. This information on respiratory motion within the lungs was combined with the end-expiration and time-averaged NCAT phantoms to allow the creation of source and attenuation maps for the normal background distribution of Tc-99m NeoTect. With the source and attenuation distribution thus defined, the SIMIND Monte Carlo program was used to produce SPECT projection data for the normal background and separately for each of 150 end-expiration and time-averaged simulated 1.0 cm tumors. Normal and tumor SPECT projection sets each containing one lesion were combined with a clinically realistic noise level and counts. These were reconstructed with RBI-EM using 1) no correction (NC), 2) attenuation correction (AC), 3) detector response correction (RC), and 4) attenuation correction, detector response correction, and scatter correction (AC_RC_SC). The post-reconstruction parameters of number of iterations and 3-D Gaussian filtering were optimized by human-observer studies. Comparison of lesion detection by human-observer LROC studies reveals that respiratory motion degrades tumor detection for all four reconstruction strategies, and that the magnitude of this effect is greatest for NC and RC, and least for AC_RC_SC. Additionally, the AC_RC_SC strategy results in the best detection of lesions.

Keywords

Motion detection, Attenuation, Lesions, Lungs, Neoplasms, Image reconstruction, Detectors, Single photon emission computed tomography, Optical computing, Computed tomography

DOI of Published Version

10.1109/NSSMIC.2007.4436830

Source

Smyczynski MS, Gifford HC, Lehovich A, McNamara JE, Segars WP, Tsui BM, King MA. Impact of respiratory motion on the detection of small pulmonary nodules in SPECT imaging. IEEE Nucl Sci Symp Conf Rec (1997). 2007;5:3241-3245. doi: 10.1109/NSSMIC.2007.4436830. PMID: 19169431; PMCID: PMC2630211. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

IEEE Nuclear Science Symposium conference record. Nuclear Science Symposium

PubMed ID

19169431

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