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Advanced Search Results For "COMPUTED tomography"

1 - 10 of 726,992 results for
 "COMPUTED tomography"
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A dose-neutral image quality comparison of different CBCT and CT systems using paranasal sinus imaging protocols and phantoms.

Publication Type:Academic Journal

Source(s):European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery [Eur Arch Otorhinolaryngol] 2022 Sep; Vol. 279 (9), pp. 4407-4414. Date of Electronic Publication: 2022 Jan 27.

Abstract:Purpose: To compare the image quality produced by equivalent low-dose and default sinus imaging protocols of a conventional dental cone-beam computed tomography (CBCT) scanner, an extremity CBCT scanner and a clinical multidetector computed tomography ...

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Radiation doses from low-dose CT scans in SPECT/CT and PET/CT examinations: A survey in Germany.

Publication Type:Academic Journal

Source(s):Nuklearmedizin. Nuclear medicine [Nuklearmedizin] 2022 Aug; Vol. 61 (4), pp. 294-300. Date of Electronic Publication: 2022 Apr 06.

Abstract:Aim: Recently, dose reference levels (DRLs) have been defined in Germany for auxiliary low-dose CT scans in hybrid SPECT/CT and PET/CT examinations, based on data from 2016/17. Here, another survey from 2020 was evaluated and compared with the new DRLs...

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Toward a Patient-Specific Traceable Quantification of SPECT/CT-Based Radiopharmaceutical Distributions.

Publication Type:Academic Journal

Source(s):Journal of nuclear medicine : official publication, Society of Nuclear Medicine [J Nucl Med] 2022 Jul; Vol. 63 (7), pp. 1108-1116. Date of Electronic Publication: 2021 Nov 18.

Abstract:Quantitative SPECT/CT imaging is currently the state of the art for peritherapeutic monitoring of radiopharmaceutical distributions. Because of poor resolution, however, the verification of SPECT/CT-based activity distributions is of particular importa...

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Factors influencing the safety of outpatient coronary CT angiography: a clinical registry study.

Publication Type:Academic Journal

Source(s):BMJ open [BMJ Open] 2022 Aug 08; Vol. 12 (8), pp. e058304. Date of Electronic Publication: 2022 Aug 08.

Abstract:Objectives: Since the safety of coronary CT angiography (CTA) is of great importance, especially with regard to widening indications and increasing morbidity, the aim of this study was to assess influencing factors.Methods: Patients undergoing coronary...

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CT imaging with ultra-high-resolution: Opportunities for cardiovascular imaging in clinical practice.

Publication Type:Academic Journal

Source(s):Journal of cardiovascular computed tomography [J Cardiovasc Comput Tomogr] 2022 Sep-Oct; Vol. 16 (5), pp. 388-396. Date of Electronic Publication: 2022 Feb 11.

Abstract:Cardiovascular computed tomography (CT) angiography has become an established alternative to invasive catheter angiography. However, imaging artifacts due to partial volume effects with current systems hinder accurate evaluation of calcified or stented...

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CDFRegNet: A cross-domain fusion registration network for CT-to-CBCT image registration.

Publication Type:Academic Journal

Source(s):Computer methods and programs in biomedicine [Comput Methods Programs Biomed] 2022 Sep; Vol. 224, pp. 107025. Date of Electronic Publication: 2022 Jul 15.

Abstract:Background and Objective: Computer tomography (CT) to cone-beam computed tomography (CBCT) image registration plays an important role in radiotherapy treatment placement, dose verification, and anatomic changes monitoring during radiotherapy. However, ...

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Is a single late SPECT/CT based kidney 177 Lu-dosimetry superior to hybrid dosimetry with sequential multiple time-point whole-body planar scans in combination with an early SPECT/CT?

Publication Type:Academic Journal

Source(s):Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) [Phys Med] 2022 Aug; Vol. 100, pp. 39-50. Date of Electronic Publication: 2022 Jun 17.

Abstract:Purpose: The aim is to assess the impact of different imaging-protocols on image-based kidney dosimetry in 177 Lu labelled peptide receptor radiotherapies.Methods: Kidney data of five [ 177 Lu]Lu-OPS201 injected pigs and a 3D printed phantom were used ...

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Deep learning-based time-of-flight (ToF) image enhancement of non-ToF PET scans.

Publication Type:Academic Journal

Source(s):European journal of nuclear medicine and molecular imaging [Eur J Nucl Med Mol Imaging] 2022 Sep; Vol. 49 (11), pp. 3740-3749. Date of Electronic Publication: 2022 May 04.

Abstract:Purpose: To improve the quantitative accuracy and diagnostic confidence of PET images reconstructed without time-of-flight (ToF) using deep learning models trained for ToF image enhancement (DL-ToF).Methods: A total of 273 [ 18 F]-FDG PET scans were us...

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Evaluation of Short-Term Efficacy of PD-1 Monoclonal Antibody Immunotherapy for Lymphoma by Positron Emission Tomography/Computed Tomography Imaging with Convolutional Neural Network Image Registration Algorithm.

Publication Type:Academic Journal

Source(s):Contrast media & molecular imaging [Contrast Media Mol Imaging] 2022 Aug 31; Vol. 2022, pp. 1388517. Date of Electronic Publication: 2022 Aug 31 (Print Publication: 2022).

Abstract:The objective of this study was to investigate the value of PET/CT imaging based on CNN image registration algorithm in evaluating the short-term efficacy of PD-1 monoclonal antibody immunotherapy for lymphoma. 36 patients with advanced lymphoma confir...

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DeTransUnet: attenuation correction of gated cardiac images without structural information.

Publication Type:Academic Journal

Source(s):Physics in medicine and biology [Phys Med Biol] 2022 Aug 16; Vol. 67 (16). Date of Electronic Publication: 2022 Aug 16.

Abstract:Objective. Myocardial perfusion imaging (MPI) with positron emission tomography (PET) is a non-invasive imaging method, and it is of great significance to the diagnosis and prognosis of coronary heart disease. Attenuation correction (AC) for PET images...

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