Optimizing rod window width in positron emission tomography

@article{Jones1992OptimizingRW,
  title={Optimizing rod window width in positron emission tomography},
  author={William F. Jones and Ward M. Digby and Wing K. Luk and Michael E. Casey and Larry G. Byars},
  journal={IEEE Conference on Nuclear Science Symposium and Medical Imaging},
  year={1992},
  pages={982-984 vol.2}
}
  • W. Jones, W. Digby, L. Byars
  • Published 1 June 1995
  • Physics
  • IEEE Conference on Nuclear Science Symposium and Medical Imaging
A technique that determines optimal rod window width for rotating rod transmission studies in positron emission tomography (PET) is discussed. Rod windowing reduces noise in rotating rod transmission studies. Lines-of-response (LOR) which intersect the rods generate primarily true coincidence events. LORs which pass far from the rods generate random and scatter events. Since the angular position of the rotating rods is known in real-time, LORs, which produce mostly noise are gated off.<<ETX>> 

Figures from this paper

Post-injection attenuation correction for PET scanners without measured random correction

TLDR
The correction for post-injection transmission data was extended to take into account the effect of the rod windowing and the 'mixed' randoms, which can be used for most tomographs without a measured random correction.

Improved correction of post-injection transmission data for PET scanners without measured random correction

TLDR
The correction for post-injection transmission data was extended to take into account the effect of the rod windowing and the 'mixed' randoms, which can be used for most tomographs without a measured random correction.

Fast-channel LSO detectors and fiber-optic encoding for excellent dual photon transmission measurements in PET

Improved attenuation correction remains critical to PET. Currently with dual photon rotating rod sources, benefits of windowing are limited by counting losses of detectors nearest the rods, the near

Design and performance of collimated coincidence point sources for simultaneous transmission measurements in 3-D PET

The authors have implemented a simultaneous emission-transmission measurement for three-dimensional positron emission tomography (3-D PET) using a collimated coincidence point source design employing

Optimisation of simultaneous emission and transmission measurements in PET

TLDR
Initial results of total body PET studies are presented employing the methods described combined with accelerated EM reconstruction, with results less than 10% difference in SNR between simultaneous and separate measurements.

An analysis of correction methods for emission contamination in PET postinjection transmission measurement

Three techniques for estimation of emission contamination in PET postinjection transmission scans (PITSs) were evaluated and compared. For PET scanners with electronic windowing of events that

An analysis of correction methods for emission contamination in PET post-injection transmission measurement

The authors have evaluated and compared three techniques for estimation of emission contamination in PET post-injection transmission scans (PITSs). For PET scanners with electronic windowing of

Optimization of attenuation correction for positron emission tomography studies of thorax and pelvis using count-based transmission scans

TLDR
It can be concluded that count-based transmission scans compensate for radioactive decay of the rod sources and results in statistically more consistent transmission scans as compared with fixed transmission scan duration.

Simultaneous emission and transmission measurements for attenuation correction in whole-body PET.

TLDR
Attenuation correction of whole-body PET images is feasible using SET measurements and there is good quantitative agreement with conventional methods and increased noise is offset by the use of SAC and OS-EM reconstruction.

[Accuracy of attenuation coefficient obtained by 137Cs single-transmission scanning in PET: comparison with conventional germanium line source].

TLDR
Although Cs-137 single-transmission scans contained scattered photons, attenuation coefficient error could be reduced using by the segmentation method, suggesting that scattered photons depend on object size.
...

References

SHOWING 1-10 OF 28 REFERENCES

Sampling Properties of Stationary and Half-Rotation Rings in Positron Emission Tomography

TLDR
It is shown that, although the half-rotation motion provides an improvement if the data are treated as a set of parallel projections, there is no improvement when divergent projections are assumed by the reconstruction procedure.

Post-injection transmission attenuation measurements for PET

The acquisition of positron-emission-tomography (PET) transmission information after tracer injection using ring and rotating pin transmission sources is discussed. A combined transmission/emission

A method for postinjection PET transmission measurements with a rotating source.

TLDR
Applications of the technique can significantly shorten the time between transmission and emission studies, and thereby reduce the likelihood of patient motion and increase scanning throughput.

Simultaneous transmission and emission scans in positron emission tomography

Transmission scans are performed using a point source of Ge-68 masked by lead into a fan beam of annihilation photons in each scanning plane of the tomograph. As the source orbits the patient,

A Technique To Reject Scattered Radiation In PET Transmission Scans

TLDR
The technique presented here reduces the scatter fraction in transmission scans by using an orbiting rod source in place of the ring source normally used for transmission scans.

Validation of simultaneous PET emission and transmission scans.

TLDR
A technique for performing simultaneous PET emission and transmission scans is validated in a fluoro-deoxyglucose study and the RMS difference between profile contours through many brain regions is approximately 40% higher comparing two simultaneous emission/transmission scans than when the same analysis is performed on independent emission scans.

A noise equivalent counts approach to transmission imaging and source design

  • C. StearnsD. Wack
  • Physics
    Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference
  • 1991
TLDR
The authors have extended the method to include the effects of transmission imaging on the statistics of attenuation-corrected PET data, and produced a noise figure which describes the SNR (signal-to-noise ratio) performance of the elements of the attenuated emission sinogram.

Correction for Scattered Radiation in a Ring Detector Positron Camera by Integral Transformation of the Projections

TLDR
A “deconvolution” algorithm for the determination of the scatter contribution in positron emission tomography is described and the level of scattered radiation can be reduced from 25 to 1% of the total count rate in the center of the projection from a homogeneous phantom.

Data Acquisition, Reconstruction and Display for the Donner 280-Crystal Positron Tomograph

The imaging system for the Donner 280-Crystal Positron Tomograph is described. The architecture of the hardwired data acquisition system (histogrammer) allows a data rate in excess of two million

Performance Evaluation of the Positron Scanner ECAT EXACT

TLDR
Brain, heart, and whole-body studies with the new tomography demonstrate the versatility of its applications without compromising on physical performance.