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Chapter and Conference Paper
Size and Shape of Spherical Objects on Full-Field Digital Mammography and Digital Breast Tomosynthesis Images
This study assessed the accuracy of shape and size representation of spherical objects on full-field digital mammography (FFDM) and digital breast tomosynthesis (DBT) images. Six 5-mm-thick polymethylmethacryl...
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Chapter and Conference Paper
Temporal Characterization of the Flat-Bed Scanner Influencing Dosimetry Using Radiochromic Film
Radiochromic films (RFs) have been developed for the measurement of the absorbed dose of low-energy photons. RFs are self-develo** and radiation sensitive, and the amount of darkening is proportional to the ...
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Chapter and Conference Paper
Optimal Variable Refocus Flip Angle Control Method and Echo Train Length for Suppressing Exposure to Radio Frequency
The popularization of 3-Tesla magnetic resonance imaging (MRI) has improved the quality of images and shortened typical examination times. However, a side effect of this is increased exposure to radio frequenc...
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Chapter and Conference Paper
Influence of Image Resolution Property on Aliasing Error of Digital Wiener Spectrum
The noise properties of a radiography system are commonly described by its wiener spectrum (WS). The two-dimensional discrete Fourier transform (2D-DFT) methods is the most commonly used and accepted technique...
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Chapter and Conference Paper
Evaluation of Effective Energy Distribution of 320-Multidetector CT Using GAFCHROMIC EBT3
Knowledge of the effective energy of 320-multidetector computed tomography (CT) is important for quality assurance and quality control. Evaluation in two dimensions is necessary because the effective energy va...
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Chapter and Conference Paper
Basic research on countermeasures against barium sulfate aggregation using a gastric phantom
The principal aim of this study was to conduct basic experiments to examine countermeasures against barium sulfate aggregation caused by denture adhesive in gastric cancer screening test. Experiment 1; barium ...
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Chapter and Conference Paper
Ultraviolet Ray Strength for Pre-irradiation in Gafchromic EBT2
Ultraviolet (UV) rays strength and density change of Gafchromic EBT2 were investigated. It has previously been suggested that UV rays can be used as a substitute for the X-ray double-irradiation technique to c...
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Chapter and Conference Paper
Influence of scattered radiation on Gafchromic EBT3
Gafchromic EBT3 (EBT3) is used as a radiochromic film in half-value layer (HVL) measurement methods, which are used to calculate the effective energy for QA and QC. HVL measurements using EBT3 display a precis...
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Chapter and Conference Paper
UV Intensity of Pre-irradiation in Gafchromic XR-RV3 and XR-SP2
UV-A irradiation of Gafchromic XR-RV3 and XR-SP2 are considered to be a substitute for X-ray irradiation in the double irradiation of Gafchromic XR-RV3 and XR-SP2. It makes it possible to compensate for hetero...
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Article
Accuracy assessment methods of tissue marker clip placement after 11-gauge vacuum-assisted stereotactic breast biopsy: comparison of measurements using direct and conventional methods
The objective of the study was to compare direct measurement with a conventional method for evaluation of clip placement in stereotactic vacuum-assisted breast biopsy (ST-VAB) and to evaluate the accuracy of c...
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Chapter
Understanding Medical Images Based on Computational Anatomy Models
This chapter presents examples of medical image understanding algorithms using computational anatomy models explained in Chap. 2. After the introductory in Sect. 3.1, Se...
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Chapter and Conference Paper
Evaluation of Scanner Image Properties of Radiochromic Film for Measuring Effective Energy
The effective energy calculated using the half-value layer (HVL) is an important parameter for quality assurance (QA) and quality control (QC). However constant monitoring has not been performed because measur...
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Chapter and Conference Paper
Evaluation of Dose Distribution According to Patient Setup Errors in Pediatric Head CT Examination: A Phantom Study
Radiation doses during computed tomography (CT) examinations are generally evaluated by CT dose index (CTDI). The CTDI is measured by means of a CTDI phantom, which is placed in the center of the CT gantry ape...
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Article
Effectiveness of the new injection program ‘saline test injection mode’ for use power injector in pediatric contrast CT
To improve the safety of the use of a power injector for pediatric contrast CT, we newly developed a saline test injection mode for a power injector and investigated its usefulness. We used an injection route ...
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Article
Evaluation of GAFCHROMIC EBT2 dosimetry for the low dose range using a flat-bed scanner with the reflection mode
Recently developed radiochromic films can easily be used to measure absorbed doses because they do not need development processing and indicate a density change that depends on the absorbed dose. However, in G...
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Chapter and Conference Paper
Effects of Bolus Volume on Geniohyoid Muscle Movement during Swallowing: Ultrasonographic M-Mode Study in Healthy Adults
Purpose: Videofluoroscopy is generally considered a “gold standard” technique for diagnosing dysphagia; however this technique exposes subjects to radiation. Ultrasonography is applied widely in clinical pract...
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Article
Predicting sentinel lymph node metastasis in breast cancer with lymphoscintigraphy
Lymphoscintigraphy is an effective method for detecting sentinel lymph nodes (SLNs). However, the rate and degree of SLN detection is not uniform. We quantified SLNs detected with lymphoscintigraphy, and inves...
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Article
Improved detection of gastric cancer during screening by additional radiographs as judged necessary by the radiographer
The aim of this study was to determine whether additional radiographs, as judged necessary by the radiographer, improves cancer detection during gastric cancer screening.
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Article
Sonographic assessment of hyoid bone movement during swallowing: a study of normal adults with advancing age
Our aim in this study was to evaluate hyoid bone movement trajectories and the age-related changes during swallowing in healthy subjects by ultrasonography. Data were obtained from 30 healthy volunteers (15 me...
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Article
Film-reading ability of radiographers in detecting gastric cancer during screening using X-ray examination
The aim of this study was to evaluate the film-reading ability of radiographers in detecting gastric cancer during screening X-ray examinations.
