Motion detection and correction in Tl-201 SPECT imaging: A simple, practical method
Since Tl-201 SPECT imaging requires that pts remain in an awkward position for a prolonged time, pt motion (M) is a potentially serious source of artifactual defects on tomographic (tomo) reconstructions. Thus the authors developed a simple method for detection and correction of M from SPECT images. A Co-57 point source is placed on the lower anterior chest, an area remaining in the camera's field of view throughout imaging, and is imaged concurrently with Tl. In the absence of M, this point source inscribes a straight line on planar summation of the 32 projections over 180/sup 0/. Movement is detected by deviation from this line. The number of pixels (P) of M is used to shift images so that the resultant images of the point source are linear. The method was tested in 48 consecutive patients undergoing Tl tomo. Uncorrected and corrected images were reconstructed, and long- and short-axis tomo cuts were quantitatively analyzed using circumferential profiles (CPs) of maximum counts with comparison to lower limits of normal. Extent (E) of abnormality was expressed as the % of CP points falling below normal. M was detected in 8/48 pts (17%) and was 2 P in 3 and 1 P in 5 pts. E was less following correction in 7/8 pts, with a mean decrease of 71% with 2 PM and 44% with 1 PM. Visual change in tomo after correction was dramatic with 2 PM and subtle with 1 PM. The E and location of tomo abnormality after correction more closely resembled subsequent planar imaging than did the uncorrected reconstructions. The authors conclude: 1) pt M is a common problem in SPECT Tl images; 2) when > 1 pixel, M results in major tomographic artifacts; and 3) the method described provides a simple practical approach for detection and correction of M.
- Research Organization:
- Cedars-Sinai Medical Center, Los Angeles, CA
- OSTI ID:
- 6842943
- Report Number(s):
- CONF-840619-
- Journal Information:
- J. Nucl. Med.; (United States), Vol. 25:5; Conference: 31. annual meeting of the Society of Nuclear Medicine, Los Angeles, CA, USA, 5 Jun 1984
- Country of Publication:
- United States
- Language:
- English
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CHEST
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
COBALT 57
DIAGNOSTIC USES
THALLIUM 201
ACCURACY
CORRECTIONS
IMAGE PROCESSING
IMAGES
MOTION
PATIENTS
POSITIONING
BETA DECAY RADIOISOTOPES
BODY
BODY AREAS
COBALT ISOTOPES
COMPUTERIZED TOMOGRAPHY
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
ELECTRON CAPTURE RADIOISOTOPES
EMISSION COMPUTED TOMOGRAPHY
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
PROCESSING
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
THALLIUM ISOTOPES
TOMOGRAPHY
USES
550602* - Medicine- External Radiation in Diagnostics- (1980-)
550601 - Medicine- Unsealed Radionuclides in Diagnostics