Respiratory-Induced Prostate Motion

Dinkel, Julien; Thieke, Christian; Plathow, Christian; Zámecnik, Patrik; Prüm, Hermann; Huber, Peter E.; Kauczor, Hans Ulrich; Schlemmer, Heinz Peter; Zechmann, Christian M.

doi:10.1007/s00066-011-2201-2

Cited by 20 publications

(11 citation statements)

References 57 publications

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“…The actual average displacement of the signal can be much higher than 1 or 2 mm. For this reason, the amplitude reported in this article is much smaller than what is normally reported in the literature on deep breathing (14). …”

Section: Resultscontrasting

confidence: 65%

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Respiratory-Induced Prostate Motion Using Wavelet Decomposition of the Real-Time Electromagnetic Tracking Signal

Lin

Liu

Yang

et al. 2013

International Journal of Radiation Oncology*Biology*Physics

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Purpose The objective of this work is to characterize and quantify the impact of respiratory-induced prostate motion. Methods and Materials Real-time intrafraction motion is observed with the Calypso 4-dimensional nonradioactive electromagnetic tracking system (Calypso Medical Technologies, Inc. Seattle, Washington). We report the results from a total of 1024 fractions from 31 prostate cancer patients. Wavelet transform was used to decompose the signal to extract and isolate the respiratory-induced prostate motion from the total prostate displacement. Results Our results show that the average respiratory motion larger than 0.5 mm can be observed in 68% of the fractions. Fewer than 1% of the patients showed average respiratory motion of less than 0.2 mm, whereas 99% of the patients showed average respiratory-induced motion ranging between 0.2 and 2 mm. The maximum respiratory range of motion of 3 mm or greater was seen in only 25% of the fractions. In addition, about 2% patients showed anxiety, indicated by a breathing frequency above 24 times per minute. Conclusions Prostate motion is influenced by respiration in most fractions. Real-time intrafraction data are sensitive enough to measure the impact of respiration by use of wavelet decomposition methods. Although the average respiratory amplitude observed in this study is small, this technique provides a tool that can be useful if one moves to smaller treatment margins (≤5 mm). This also opens ups the possibility of being able to develop patient specific margins, knowing that prostate motion is not unpredictable.

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Section: Resultscontrasting

confidence: 65%

“…For a total of 20 patients, mean displacement was 1.6 mm and 2.9 mm in the AP and SI directions, respectively. Dinkel et al (14) evaluated respiratory-induced prostate motion using cine–magnetic resonance imaging. The temporal resolution was 3 frames per second, and the total acquisition time was 15 seconds.…”

Section: Discussionmentioning

confidence: 99%

Respiratory-Induced Prostate Motion Using Wavelet Decomposition of the Real-Time Electromagnetic Tracking Signal

Lin

Liu

Yang

et al. 2013

International Journal of Radiation Oncology*Biology*Physics

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“…For example, the range of motion of the prostate due to coughing was 0.6 to 27 mm and 0.7 to 26 mm in the cranio-caudal and anterior-posterior directions, respectively, values that were significantly larger than those observed during normal respiration in the same group of subjects (25). …”

Section: Motion In Whole-body Imaging Studies: Sources and Magnitudementioning

confidence: 81%

“…A true fast imaging with steady-state precession (TrueFISP) MR sequence was used to acquire dynamic imaging of the prostate at 3 frames/second for several breathing cycles in healthy volunteers and patients with adenocarcinoma of the prostate (25). In approximately a third of the patients, the motion of the prostate was assessed with and without an endorectal coil present for the MR examination.…”

Section: Motion In Whole-body Imaging Studies: Sources and Magnitudementioning

confidence: 99%

Motion Correction Options in PET/MRI

Catana

2015

Seminars in Nuclear Medicine

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Subject motion is unavoidable in clinical and research imaging studies. Breathing is the most important source of motion in whole-body positron emission tomography (PET) and magnetic resonance imaging (MRI) studies, affecting not only thoracic organs but also those in the upper and even lower abdomen. The motion related to the pumping action of the heart is obviously relevant in high-resolution cardiac studies. These two sources of motion are periodic and predictable, at least to a first approximation, which means certain techniques can be used to control the motion (e.g. by acquiring the data when the organ of interest is relatively at rest). Additionally, non-periodic and unpredictable motion can also occur during the scan. One obvious limitation of methods relying on external devices (e.g. respiratory bellows or the ECG signal to monitor the respiratory or cardiac cycle, respectively) to trigger or gate the data acquisition is that the complex motion of internal organs cannot be fully characterized. However, detailed information can be obtained either using the PET or MRI data (or both) allowing the more complete characterization of the motion field so that a motion model can be built. Such a model and the information derived from simple external devices can be used to minimize the effects of motion on the collected data. In the ideal case, all the events recorded during the PET scan would be used to generate a motion free/corrected PET image. The detailed motion field can be used for this purpose by applying it to the PET data before, during or after the image reconstruction. Integrating all these methods for motion control, characterization and correction into a workflow that can be used for routine clinical studies is challenging but could potentially be extremely valuable given the improvement in image quality and reduction of motion-related image artifacts.

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“…For prostate radiotherapy, previous studies have shown that the shape and position of the target varies from day to day (interfraction motion) and during treatment (intrafraction motion), due to variability in patient setup, bladder and bowel filling, and patient respiration 1, 2. The prostate gland is liable to nontrivial combined intra‐ and interfractional movements and rotations, with most motion occurring in the anteroposterior and superoinferior planes, and around the left‐right axis (pitch) 1, 2, 3, 4, 5…”

Section: Introductionmentioning

confidence: 99%

Comparison between electromagnetic transponders and radiographic imaging for prostate localization: A pelvic phantom study with rotations and translations

Hamilton

McKenzie

Perkins

2017

J Applied Clin Med Phys

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The aim of this study was to evaluate the differences in target localization between Calypso®, kV orthogonal imaging and cone‐beam computed tomography (CBCT) for combined translations and rotations of an anthropomorphic pelvic phantom. The phantom was localized using all three systems in 50 different positions, with applied translational and rotational offsets randomly sampled from representative normal distributions of prostate motion. Lin's concordance correlation coefficient (ρc) and 95% confidence intervals were calculated to assess the agreement between the localization systems. Mean differences and difference vectors between the three systems were also calculated. Agreement between systems for lateral, vertical, and longitudinal translations was excellent, with ρc values of greater than 0.98 between all three systems in all axes. There was excellent agreement between the systems for rotations around the lateral axis (pitch) (ρc > 0.99), and around the vertical axis (yaw) (ρc > 0.97). However, somewhat poorer agreement for rotations around the longitudinal axis (roll) was observed, with the lowest correlation observed between Calypso and kV orthogonal imaging (ρc = 0.895). Mean differences between the phantom position reported by Calypso and the radiographic systems were less than 1 mm and 1° for all translations and rotations. The results for translations are consistent with the publications of previous authors. There is no comparable published data for rotations. While there is lower correlation between the three systems for roll than for the other angles, the mean differences in reported rotations are not clinically significant.

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Respiratory-Induced Prostate Motion

Abstract: Dynamic MRI is an excellent tool for noninvasive real-time imaging of prostate movement. Further investigations regarding possible applications in image-guided radiotherapy, e.g., for individualized planning and in integrated linac/MRI systems, are warranted.

Cited by 20 publications

References 57 publications

Respiratory-Induced Prostate Motion Using Wavelet Decomposition of the Real-Time Electromagnetic Tracking Signal

Respiratory-Induced Prostate Motion Using Wavelet Decomposition of the Real-Time Electromagnetic Tracking Signal

Motion Correction Options in PET/MRI

Comparison between electromagnetic transponders and radiographic imaging for prostate localization: A pelvic phantom study with rotations and translations

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