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Novel Ingestible Capsule X-Ray Dosimeter Enables Real-Time Radiotherapy Monitoring

By MedImaging International staff writers
Posted on 17 Apr 2023
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Image: The components of the dosimeter can fit into an 18mm by 7mm capsule (Photo courtesy of University of NUS)
Image: The components of the dosimeter can fit into an 18mm by 7mm capsule (Photo courtesy of University of NUS)

Gastric cancer ranks among the most prevalent cancers worldwide. Precision is vital in modern radiotherapy, as it aims to target tumor cells while minimizing damage to healthy tissue. However, challenges such as diverse patient populations, treatment uncertainties, and varying delivery methods result in low efficacy and inconsistent outcomes. Real-time monitoring of radiation doses, particularly within the gastrointestinal tract, could enhance radiotherapy precision and effectiveness, but it remains a difficult task. Furthermore, current methods for tracking biochemical indicators like pH and temperature fall short in providing a comprehensive evaluation of radiotherapy. Now, a new invention may improve gastric cancer treatment by boosting the precision of radiotherapy, which is often combined with surgery, chemotherapy, or immunotherapy.

Conventional clinical dosimeters, such as metal-oxide-semiconductor field-effect transistors, thermoluminescence sensors, and optically stimulated films, are typically placed on or near a patient's skin to estimate the radiation dose absorbed in the targeted area. While electronic portal imaging devices have been investigated for treatment verification, these devices can be costly and absorb radiation, thereby reducing the patient's intended radiation dose. Ingestible sensors have been limited to monitoring pH and pressure, creating the need for an affordable swallowable sensor that can simultaneously track biochemical indicators and X-ray dose absorption during gastrointestinal radiotherapy. A research team at the National University of Singapore (NUS, Singapore) has created an ingestible X-ray dosimeter capable of real-time radiation dose detection. By integrating their innovative capsule design with a neural-network-based regression model that calculates radiation dose based on data captured by the capsule, the researchers achieved approximately five times more accurate dose monitoring compared to existing standard methods.

The novel ingestible X-ray dosimeter can measure radiation dose, pH changes, and temperature in real time during gastrointestinal radiotherapy. The capsule's main components consist of a flexible optical fiber wrapped in nanoscintillators that emit light in response to radiation, a pH-sensitive film, a fluidic module with multiple inlets for dynamic gastric fluid sampling, dual sensors for dose and pH measurement, a microcontroller circuit board that processes photoelectric signals for transmission to a mobile app, and a compact silver oxide battery to power the capsule.

Upon ingestion and reaching the gastrointestinal tract, the nanoscintillators emit a stronger luminescence when exposed to increased X-ray radiation. A sensor within the capsule measures this glow to determine the radiation dose delivered to the targeted area. Simultaneously, the fluidic module collects gastric fluid for pH detection by the color-changing film. This color shift is recorded by a second sensor inside the capsule. Additionally, both sensors can detect temperature, providing insight into potential adverse reactions to radiotherapy treatment, such as allergic responses.

The microcontroller circuit board processes photoelectric signals from the two sensors and transmits the information to a mobile app using Bluetooth technology and an antenna. The mobile app employs a neural network-based regression model to process the raw data, displaying information such as radiotherapy dose, temperature, and pH of the tissues undergoing treatment. The capsule dosimeter measures 18mm in length and 7mm in width, a standard size for supplements and medications, and has a production cost of S$50.

While currently designed for monitoring radiotherapy doses in gastric cancer, the capsule could also be adapted to track treatment for various malignancies with modifications to its size. For instance, a smaller capsule could be inserted into the rectum for prostate cancer brachytherapy or the upper nasal cavity for real-time measurement of absorbed doses in nasopharyngeal or brain tumors, minimizing radiation damage to adjacent structures. The research team is striving to advance their innovation toward clinical application. Future research includes determining the capsule's location and orientation after ingestion, devising a reliable positioning system to secure the capsule at the target site, and refining the accuracy of the ingestible dosimeters for safe and effective clinical use.

“Our novel capsule is a game-changer in providing affordable and effective monitoring of the effectiveness of radiotherapy treatment. It has the potential to provide quality assurance that the right dose of radiation will reach patients,” said Professor Liu Xiaogang from the Department of Chemistry under the NUS Faculty of Science, who led the research team.

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88 (186.92016601562): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294796866 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (103.95050048828): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (406.02684020996): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (506.87789916992): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (218.86825561523): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (597.00012207031): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (454.90264892578): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (121.11663818359): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (74.148178100586): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (108.95729064941): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (154.97207641602): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (68.902969360352): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (94.890594482422): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (151.8726348877): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (107.0499420166): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (140.90538024902): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (478.98292541504): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
105 (244.140625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
106 (236.03439331055): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (288.00964355469): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (809.90791320801): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
109 (636.10076904297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
110 (254.15420532227): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (603.91426086426): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (527.85873413086): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (339.98489379883): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
115 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
116 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
117 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
118 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
119 (36.001205444336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
120 (174.04556274414): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 61100.006103516): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
122 (194.78797912598): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
123 (130.89179992676): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
124 (!!!!! 1357.0785522461): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294796866 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294796866 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 712552.07061768): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (!!!!! 593713.99879456): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (155.21049499512): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (123.97766113281): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (161.88621520996): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (122.0703125): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (128.98445129395): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (119.92454528809): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (!!!!! 2752.0656585693): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (!!!!! 1394.9871063232): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (56.982040405273): SELECT name FROM jos_deeppockets WHERE id=213
136 (28.133392333984): SELECT name FROM jos_deeppockets WHERE id=213
137 (497.81799316406): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (413.89465332031): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
140 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
141 (!!!!! 8469.1047668457): TRUNCATE TABLE jos_trademed_module
142 (487.8044128418): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (309.94415283203): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294796866 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (507.83157348633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (223.87504577637): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (365.01884460449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
147 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
148 (!!!!! 1190.9008026123): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
149 (159.02519226074): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
150 (186.92016601562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
151 (113.96408081055): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294796866 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294796866 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (87.02278137207): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
153 (829.21981811523): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
154 (87.976455688477): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (777.00614929199): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
156 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294796866 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294796866 AND published='1' LIMIT 1
157 (43.869018554688): select jos_twitters.link from jos_twitters where cat=10
158 (36.001205444336): select jos_facebook.link from jos_facebook where cat=10
159 (30.994415283203): select jos_google_plus.link from jos_google_plus where cat=10
160 (27.894973754883): select jos_linkedin.link from jos_linkedin where cat=10
161 (277.99606323242): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1308.9179992676): insert into jos_banners_delta values (14615,'2025-04-29 23:13:23','18.189.143.114','view'),(14202,'2025-04-29 23:13:23','18.189.143.114','view'),(14203,'2025-04-29 23:13:23','18.189.143.114','view')