scholarly journals Geometric and dosimetric impact of 3D generative adversarial network-based metal artifact reduction algorithm on VMAT and IMPT for the head and neck region

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Mitsuhiro Nakamura ◽  
Megumi Nakao ◽  
Keiho Imanishi ◽  
Hideaki Hirashima ◽  
Yusuke Tsuruta
Keyword(s):  
Head And Neck ◽  
Neck Region ◽  
The Other ◽  
Artifact Reduction ◽  
Metal Artifact Reduction ◽  
Metal Artifacts ◽  
Generative Adversarial Network ◽  
Head And Neck Region ◽  
Dental Fillings ◽  
Adversarial Network

Abstract Background We investigated the geometric and dosimetric impact of three-dimensional (3D) generative adversarial network (GAN)-based metal artifact reduction (MAR) algorithms on volumetric-modulated arc therapy (VMAT) and intensity-modulated proton therapy (IMPT) for the head and neck region, based on artifact-free computed tomography (CT) volumes with dental fillings. Methods Thirteen metal-free CT volumes of the head and neck regions were obtained from The Cancer Imaging Archive. To simulate metal artifacts on CT volumes, we defined 3D regions of the teeth for pseudo-dental fillings from the metal-free CT volumes. HU values of 4000 HU were assigned to the selected teeth region of interest. Two different CT volumes, one with four (m4) and the other with eight (m8) pseudo-dental fillings, were generated for each case. These CT volumes were used as the Reference. CT volumes with metal artifacts were then generated from the Reference CT volumes (Artifacts). On the Artifacts CT volumes, metal artifacts were manually corrected for using the water density override method with a value of 1.0 g/cm3 (Water). By contrast, the CT volumes with reduced metal artifacts using 3D GAN model extension of CycleGAN were also generated (GAN-MAR). The structural similarity (SSIM) index within the planning target volume was calculated as quantitative error metric between the Reference CT volumes and the other volumes. After creating VMAT and IMPT plans on the Reference CT volumes, the reference plans were recalculated for the remaining CT volumes. Results The time required to generate a single GAN-MAR CT volume was approximately 30 s. The median SSIMs were lower in the m8 group than those in the m4 group, and ANOVA showed a significant difference in the SSIM for the m8 group (p < 0.05). Although the median differences in D98%, D50% and D2% were larger in the m8 group than the m4 group, those from the reference plans were within 3% for VMAT and 1% for IMPT. Conclusions The GAN-MAR CT volumes generated in a short time were closer to the Reference CT volumes than the Water and Artifacts CT volumes. The observed dosimetric differences compared to the reference plan were clinically acceptable.

scholarly journals Metal Artifact Reduction in Cone-Beam Computed Tomography for Head and Neck Radiotherapy

2016 ◽  
Vol 15 (6) ◽  
pp. NP88-NP94 ◽  
Author(s):  
Mark Korpics ◽  
Paul Johnson ◽  
Rakesh Patel ◽  
Murat Surucu ◽  
Mehee Choi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Head And Neck ◽  
Cone Beam Computed Tomography ◽  
Regions Of Interest ◽  
Cone Beam ◽  
Artifact Reduction ◽  
Metal Artifacts ◽  
Dental Fillings ◽  
Computed Tomography Images ◽  
Streak Artifacts

Purpose: To evaluate a method for reducing metal artifacts, arising from dental fillings, on cone-beam computed tomography images. Materials and Methods: A projection interpolation algorithm is applied to cone-beam computed tomography images containing metal artifacts from dental fillings. This technique involves identifying metal regions in individual cone-beam computed tomography projections and interpolating the surrounding values to remove the metal from the projection data. Axial cone-beam computed tomography images are then reconstructed, resulting in a reduction in the streak artifacts produced by the metal. Both phantom and patient imaging data are used to evaluate this technique. Results: The interpolation substitution technique successfully reduced metal artifacts in all cases. Corrected images had fewer or no streak artifacts compared to their noncorrected counterparts. Quantitatively, regions of interest containing the artifacts showed reduced variance in the corrected images versus the uncorrected images. Average pixel values in regions of interest around the metal object were also closer in value to nonmetal regions after artifact reduction. Artifact correction tended to perform better on patient images with less complex metal objects versus those with multiple large dental fillings. Conclusion: The interpolation substitution is potentially an efficient and effective technique for reducing metal artifacts caused by dental fillings on cone-beam computed tomography image. This technique may be effective in reducing such artifacts in patients with head and neck cancer receiving daily image-guided radiotherapy.

Impact of iterative metal artifact reduction on diagnostic image quality in patients with dental hardware

2016 ◽  
Vol 58 (3) ◽  
pp. 279-285 ◽  
Author(s):  
Jakob Weiß ◽  
Christoph Schabel ◽  
Malte Bongers ◽  
Rainer Raupach ◽  
Stephan Clasen ◽  
...  
Keyword(s):  
Image Quality ◽  
Ct Imaging ◽  
Diagnostic Image Quality ◽  
Artifact Reduction ◽  
Metal Artifact ◽  
Metal Artifact Reduction ◽  
Metal Artifacts ◽  
Diagnostic Image ◽  
Anatomical Structures ◽  
Dental Fillings

Background Metal artifacts often impair diagnostic accuracy in computed tomography (CT) imaging. Therefore, effective and workflow implemented metal artifact reduction algorithms are crucial to gain higher diagnostic image quality in patients with metallic hardware. Purpose To assess the clinical performance of a novel iterative metal artifact reduction (iMAR) algorithm for CT in patients with dental fillings. Material and Methods Thirty consecutive patients scheduled for CT imaging and dental fillings were included in the analysis. All patients underwent CT imaging using a second generation dual-source CT scanner (120 kV single-energy; 100/Sn140 kV in dual-energy, 219 mAs, gantry rotation time 0.28–1/s, collimation 0.6 mm) as part of their clinical work-up. Post-processing included standard kernel (B49) and an iterative MAR algorithm. Image quality and diagnostic value were assessed qualitatively (Likert scale) and quantitatively (HU ± SD) by two reviewers independently. Results All 30 patients were included in the analysis, with equal reconstruction times for iMAR and standard reconstruction (17 s ± 0.5 vs. 19 s ± 0.5; P > 0.05). Visual image quality was significantly higher for iMAR as compared with standard reconstruction (3.8 ± 0.5 vs. 2.6 ± 0.5; P < 0.0001, respectively) and showed improved evaluation of adjacent anatomical structures. Similarly, HU-based measurements of degree of artifacts were significantly lower in the iMAR reconstructions as compared with the standard reconstruction (0.9 ± 1.6 vs. –20 ± 47; P < 0.05, respectively). Conclusion The tested iterative, raw-data based reconstruction MAR algorithm allows for a significant reduction of metal artifacts and improved evaluation of adjacent anatomical structures in the head and neck area in patients with dental hardware.

scholarly journals MR Image Based Approach for Metal Artifact Reduction in X-Ray CT

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Andras Anderla ◽  
Dubravko Culibrk ◽  
Gaspar Delso ◽  
Milan Mirkovic
Keyword(s):  
Linear Interpolation ◽  
Ct Images ◽  
Artifact Reduction ◽  
Metal Artifact ◽  
Metal Artifact Reduction ◽  
Metal Artifacts ◽  
Mr Image ◽  
Dental Fillings ◽  
Anatomical Information

For decades, computed tomography (CT) images have been widely used to discover valuable anatomical information. Metallic implants such as dental fillings cause severe streaking artifacts which significantly degrade the quality of CT images. In this paper, we propose a new method for metal-artifact reduction using complementary magnetic resonance (MR) images. The method exploits the possibilities which arise from the use of emergent trimodality systems. The proposed algorithm corrects reconstructed CT images. The projected data which is affected by dental fillings is detected and the missing projections are replaced with data obtained from a corresponding MR image. A simulation study was conducted in order to compare the reconstructed images with images reconstructed through linear interpolation, which is a common metal-artifact reduction technique. The results show that the proposed method is successful in reducing severe metal artifacts without introducing significant amount of secondary artifacts.

scholarly journals The effectiveness of oral propranolol for infantile hemangioma on the head and neck region: A case series

2021 ◽  
pp. 106120
Author(s):  
Prasetyanugraheni Kreshanti ◽  
Nandya Titania Putri ◽  
Valencia Jane Martin ◽  
Chaula Luthfia Sukasah
Keyword(s):  
Head And Neck ◽  
Case Series ◽  
Neck Region ◽  
Infantile Hemangioma ◽  
Head And Neck Region ◽  
Oral Propranolol

scholarly journals Therapeutic Strategies for Untreated Capillary Malformations of the Head and Neck Region: A Systematic Review and Meta-Analyses

2021 ◽  
Author(s):  
Gonca Cinkara ◽  
Ginger Beau Langbroek ◽  
Chantal M. A. M. van der Horst ◽  
Albert Wolkerstorfer ◽  
Sophie E. R. Horbach ◽  
...  
Keyword(s):  
Systematic Review ◽  
Head And Neck ◽  
Neck Region ◽  
Therapeutic Strategies ◽  
Head And Neck Region ◽  
Meta Analyses

scholarly journals Kimura disease: a rare cause of a recurrent cheek mass in a Jamaican man

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Geoffrey Williams ◽  
Carlos Neblett ◽  
Jade Arscott ◽  
Sheena McLean ◽  
Shereika Warren ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Local Recurrence ◽  
Head And Neck ◽  
African Descent ◽  
Young Men ◽  
Neck Region ◽  
Serum Immunoglobulin ◽  
Western World ◽  
Kimura Disease ◽  
Head And Neck Region

Abstract Kimura disease (KD) is a chronic, inflammatory, benign disorder endemic to Asia that typically manifests as a triad of painless masses in the head and neck region, elevated eosinophils and serum immunoglobulin. It usually affects young men in their second and third decades of life and is rarely seen outside of the orient. This is a report of a case of KD in a young man of African descent who presented with a cheek mass. KD was not included in our differential diagnosis, and this report highlights the need to consider this entity, which can be easily missed due to its rarity in the Western world. There is no cure for the disease, and management includes medical and surgical modalities, but local recurrence or relapse is not uncommon.

scholarly journals Extranodal lymphoma of the head and neck: a pictorial essay

2019 ◽  
Vol 52 (4) ◽  
pp. 268-271
Author(s):  
Pinar Gulmez Cakmak ◽  
Gülsüm Akgün Çağlayan ◽  
Furkan Ufuk
Keyword(s):  
Lymph Nodes ◽  
Head And Neck ◽  
Neck Region ◽  
Extranodal Lymphoma ◽  
Imaging Findings ◽  
Head And Neck Region ◽  
Radiological Features ◽  
Extranodal Site ◽  
Pictorial Essay

Abstract Primary extranodal lymphoma is defined as a lymphoma at a solitary extranodal site, with or without involvement of the lymph nodes. The clinical and radiological features of extranodal lymphoma have been documented in recent studies. In this pictorial essay, we reviewed imaging findings of extranodal lymphoma in the head and neck region.

scholarly journals Concomitant cemento-osseous dysplasia and aneurysmal bone cyst of the mandible: a rare case report with literature review

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Han-Gyeol Yeom ◽  
Jung-Hoon Yoon
Keyword(s):  
Case Report ◽  
Head And Neck ◽  
Aneurysmal Bone Cyst ◽  
Cystic Lesion ◽  
Bone Cyst ◽  
Neck Region ◽  
Diagnostic Process ◽  
Simultaneous Occurrence ◽  
Head And Neck Region ◽  
Osseous Dysplasia

Abstract Background Concomitant cemento-osseous dysplasia (COD) and aneurysmal bone cyst (ABC) are rare in the head and neck region. In our search of the English language literature, we found only one case report describing the simultaneous occurrence of COD and ABC in the head and neck region. Here, we report a case of COD associated with ABC. Further, we performed a systematic search of the literature to identify studies on patients with COD associated with nonepithelial lined cysts of the jaws. Case presentation The patient was a 32-year-old woman who was referred from a private dental clinic because of a cystic lesion below the mandibular right first molar. She had no pain or significant systemic disease. After performing panoramic radiography and cone-beam computed tomography, the imaging diagnosis was COD with a cystic lesion, such as ABC or solitary bone cyst. Excisional biopsy was performed, which revealed concomitant COD and ABC. Conclusion This case of ABC associated with COD provides insight for the diagnostic process of radiographically mixed lesions with cystic changes.

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