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Respiratory Motion

Controlling respiratory motion is an important issue in the diagnosis and treatment of a wide variety of conditions affecting the upper abdomen, lungs and other areas of the body as well.

Recent Posts

Respiratory Motion in Radiation Therapy:
Respiratory motion has a significant effect on the dose delivery to targets in the chest and upper abdominal cavities. To compensate for these effects relatively large margins are added to a clinical target volume (CTV), thus limiting the maximum dose delivery to these patients. Respiratory motion management may reduce the margin around a moving CTV, but is also appropriate when the procedure will increase normal tissue sparing. To account for organ motion 4D imaging technology was developed, which allows viewing of volumetric CT images changing over the fourth dimension: time. The next step is creating a 4D plan from a 4D CT set in which the tumour motion is taken into account using one of the strategies that is available to compensate for respiratory motion. The technologies mostly applied are motion-encompassing methods, respiratory gated techniques, breath-hold techniques, forced shallow-breathing methods, and respiration-synchronized techniques.(Management of respiratory motion in radiotherapy, Human Health Campus)

What this means for you is that breathing control will limit margin of error during treatment, limiting the amount of healthy tissue or organs that would be at risk.

Respiratory Motion in MRI
Dynamic contrast-enhanced (DCE)-MRI is becoming an increasingly important tool for evaluating tumor vascularity and assessing the effectiveness of emerging antiangiogenic and antivascular agents. In chest and abdominal regions, however, respiratory motion can seriously degrade the achievable image quality in DCE-MRI studies. The purpose of this work is to develop a respiratory motion-compensated DCE-MRI technique that combines the self-gating properties of radial imaging with the reconstruction flexibility afforded by the golden-angle view-order strategy. Following radial data acquisition, the signal at k-space center is first used to determine the respiratory cycle, and consecutive views during the expiratory phase of each respiratory period (34-55 views, depending on the breathing rate) are grouped into individual segments. Residual intrasegment translation of lesion is subsequently compensated for by an autofocusing technique that optimizes image entropy, while intersegment translation (among different respiratory cycles) is corrected using 3D image correlation. The resulting motion-compensated, undersampled dynamic image series is then processed to reduce image streaking and to enhance the signal-to-noise ratio (SNR) prior to perfusion analysis, using either the k-space-weighted image contrast (KWIC) radial filtering technique or principal component analysis (PCA). The proposed data acquisition scheme also allows for high frame-rate arterial input function (AIF) sampling and free-breathing baseline T(1) mapping. The performance of the proposed radial DCE-MRI technique is evaluated in subjects with lung and liver lesions, and results demonstrate that excellent pixelwise perfusion maps can be obtained with the proposed methodology.(Respiratory motion-compensated radial dynamic contrast-enhanced (DCE)-MRI of chest and abdominal lesions.Lin W1, Guo J, Rosen MA, Song HK.)

What this means for you is that the images will be easier to take and clearer for the doctor to read and make a diagnosis.

Respiratory Motion in Interventional Radiology. 
Patient respiratory motion can be a complicating factor when targeting a tumor for computed tomography (CT)–guided interventional procedures. Respiration-induced motion during the normal breathing cycle can result in significant shifts in tumor position, especially near the diaphragm, in the lung and abdomen. Consistent and reproducible breath-holds could reduce procedure time and the number of needle manipulations, promoting a safer procedure. Without a documented measure of their breath-hold position in the respiratory cycle, the patient cannot be expected to precisely reproduce similar pre- and intraprocedural breath-holds. The air bellows belt measures chest wall or abdomen excursion and provides patients with visual biofeedback during their respiratory cycle. (Respiratory Biofeedback during CT-guided Procedures Julia K. Locklin, RN, MS, Jeff Yanof, PhD, Alfred Luk, BS, Zoltan Varro, MD, Alexandru Patriciu, PhD, and Bradford J. Wood, MD)

What this means for you is that the needle used during CT will be easier to place and make sure it is on target.

Cancer

American Cancer Society | Information and Resources for Cancer
www.cancer.org

Lung Disease

American Lung Association
www.lung.org

The Bonnie J. Addario Lung Cancer Foundation
www.lungcancerfoundation.org

LCFA – Lung Cancer Foundation of Americas
www.lcfamerica.org

Breast Cancer

National Breast Cancer Foundation
www.nationalbreastcancer.org

Susan C. Komen for the Cure
www.komen.org

Breast Cancer research Foundation
www.bcrfcure.org

Kidney Disease

Kidney Cancer Association – Learn How To Survive Kidney Cancer
www.kidneycancer.org

Liver Disease

International Liver Cancer Association (ILCA)
www.ilca-online.org

Blue Faery :: The Adrienne Wilson Liver Cancer Association
www.bluefaery.org

The following professional professional organizations may also offer resources on respiratory motion or be available to answer your questions:

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