Absorbed doses from spiral CT and conventional spiral tomography: a phantom vs. cadaver study.
Identifieur interne : 003373 ( PubMed/Corpus ); précédent : 003372; suivant : 003374Absorbed doses from spiral CT and conventional spiral tomography: a phantom vs. cadaver study.
Auteurs : C. Bou Serhal ; R. Jacobs ; F. Gijbels ; H. Bosmans ; R. Hermans ; M. Quirynen ; D. Van SteenbergheSource :
- Clinical oral implants research [ 0905-7161 ] ; 2001.
English descriptors
- KwdEn :
- Aged, Aged, 80 and over, Bicuspid (diagnostic imaging), Cadaver, Humans, Image Processing, Computer-Assisted (methods), Jaw, Edentulous (diagnostic imaging), Lens, Crystalline (radiation effects), Male, Mandible (diagnostic imaging), Maxilla (diagnostic imaging), Parotid Gland (radiation effects), Phantoms, Imaging, Radiation Dosage, Submandibular Gland (radiation effects), Thermoluminescent Dosimetry (instrumentation), Thyroid Gland (radiation effects), Tomography, X-Ray (instrumentation), Tomography, X-Ray (methods), Tomography, X-Ray Computed (instrumentation), Tomography, X-Ray Computed (methods).
- MESH :
- diagnostic imaging : Bicuspid, Jaw, Edentulous, Mandible, Maxilla.
- instrumentation : Thermoluminescent Dosimetry, Tomography, X-Ray, Tomography, X-Ray Computed.
- methods : Image Processing, Computer-Assisted, Tomography, X-Ray, Tomography, X-Ray Computed.
- radiation effects : Lens, Crystalline, Parotid Gland, Submandibular Gland, Thyroid Gland.
- Aged, Aged, 80 and over, Cadaver, Humans, Male, Phantoms, Imaging, Radiation Dosage.
Abstract
For several radiological examinations, a clinician can select between conventional and spiral computed tomography. Using both techniques, this study aimed at evaluating the difference in absorbed doses when examining a single lateral jaw segment in a human cadaver head and Rando phantom. The present study involved the placement of thermoluminescent dosimeter (TLD) chips (GR-200) in the thyroid gland, and bilaterally, in the parotid and submandibular glands and the lenses of the eyes in both a human cadaver and a Rando phantom at corresponding locations. Consecutive conventional spiral tomographic examinations were carried out in both the left upper and lower premolar area, using a Cranex TOME multifunctional unit. Each examination consisted of 4 slices with a 2 mm slice thickness and exposure parameters of 57 kV, 56 seconds and 1.6-2.0 mA. Regarding spiral computed tomography (CT), a Somatom Plus S scanner (Siemens, Erlangen, Germany), with a slice thickness of 1 mm with settings at 120 kV and 165 mA, was used on both phantoms and separately in the upper and lower jaw. With conventional tomography, the findings of the present study showed that the parotid and submandibular glands on the side near the X-ray tube received the highest dose, both for the cadaver head (doses ranging from 0.5 to 1.3 mGy) and the phantom (doses ranging from 0.6 to 2.6 mGy). For CT of the upper jaw, the highest doses were delivered to the parotid glands with an average absorbed dose of 9.2 and 10.6 mGy for the cadaver head and phantom, respectively. The submandibular glands received the highest doses during CT examination of the lower jaw with an average of 7.8 and 12.9 mGy for the cadaver head and phantom, respectively. It appears from the present investigation that if small edentulous regions are examined, radiation doses during conventional tomography remain much lower than during CT imaging. However, when multiple tomographic cuts are required, a spiral CT examination can replace a series of conventional examinations, especially in cases such as the rehabilitation of an edentulous upper jaw or a more complex surgery.
PubMed: 11564107
Links to Exploration step
pubmed:11564107Le document en format XML
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<author><name sortKey="Bou Serhal, C" sort="Bou Serhal, C" uniqKey="Bou Serhal C" first="C" last="Bou Serhal">C. Bou Serhal</name>
<affiliation><nlm:affiliation>Department of Periodontology, Oral Imaging Cluster, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium.</nlm:affiliation>
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<author><name sortKey="Jacobs, R" sort="Jacobs, R" uniqKey="Jacobs R" first="R" last="Jacobs">R. Jacobs</name>
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<author><name sortKey="Gijbels, F" sort="Gijbels, F" uniqKey="Gijbels F" first="F" last="Gijbels">F. Gijbels</name>
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<author><name sortKey="Bosmans, H" sort="Bosmans, H" uniqKey="Bosmans H" first="H" last="Bosmans">H. Bosmans</name>
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<author><name sortKey="Hermans, R" sort="Hermans, R" uniqKey="Hermans R" first="R" last="Hermans">R. Hermans</name>
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<author><name sortKey="Quirynen, M" sort="Quirynen, M" uniqKey="Quirynen M" first="M" last="Quirynen">M. Quirynen</name>
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<author><name sortKey="Van Steenberghe, D" sort="Van Steenberghe, D" uniqKey="Van Steenberghe D" first="D" last="Van Steenberghe">D. Van Steenberghe</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Absorbed doses from spiral CT and conventional spiral tomography: a phantom vs. cadaver study.</title>
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<affiliation><nlm:affiliation>Department of Periodontology, Oral Imaging Cluster, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium.</nlm:affiliation>
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<author><name sortKey="Jacobs, R" sort="Jacobs, R" uniqKey="Jacobs R" first="R" last="Jacobs">R. Jacobs</name>
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<author><name sortKey="Hermans, R" sort="Hermans, R" uniqKey="Hermans R" first="R" last="Hermans">R. Hermans</name>
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<author><name sortKey="Quirynen, M" sort="Quirynen, M" uniqKey="Quirynen M" first="M" last="Quirynen">M. Quirynen</name>
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<author><name sortKey="Van Steenberghe, D" sort="Van Steenberghe, D" uniqKey="Van Steenberghe D" first="D" last="Van Steenberghe">D. Van Steenberghe</name>
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<series><title level="j">Clinical oral implants research</title>
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<term>Bicuspid (diagnostic imaging)</term>
<term>Cadaver</term>
<term>Humans</term>
<term>Image Processing, Computer-Assisted (methods)</term>
<term>Jaw, Edentulous (diagnostic imaging)</term>
<term>Lens, Crystalline (radiation effects)</term>
<term>Male</term>
<term>Mandible (diagnostic imaging)</term>
<term>Maxilla (diagnostic imaging)</term>
<term>Parotid Gland (radiation effects)</term>
<term>Phantoms, Imaging</term>
<term>Radiation Dosage</term>
<term>Submandibular Gland (radiation effects)</term>
<term>Thermoluminescent Dosimetry (instrumentation)</term>
<term>Thyroid Gland (radiation effects)</term>
<term>Tomography, X-Ray (instrumentation)</term>
<term>Tomography, X-Ray (methods)</term>
<term>Tomography, X-Ray Computed (instrumentation)</term>
<term>Tomography, X-Ray Computed (methods)</term>
</keywords>
<keywords scheme="MESH" qualifier="diagnostic imaging" xml:lang="en"><term>Bicuspid</term>
<term>Jaw, Edentulous</term>
<term>Mandible</term>
<term>Maxilla</term>
</keywords>
<keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Thermoluminescent Dosimetry</term>
<term>Tomography, X-Ray</term>
<term>Tomography, X-Ray Computed</term>
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<keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Image Processing, Computer-Assisted</term>
<term>Tomography, X-Ray</term>
<term>Tomography, X-Ray Computed</term>
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<keywords scheme="MESH" qualifier="radiation effects" xml:lang="en"><term>Lens, Crystalline</term>
<term>Parotid Gland</term>
<term>Submandibular Gland</term>
<term>Thyroid Gland</term>
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<keywords scheme="MESH" xml:lang="en"><term>Aged</term>
<term>Aged, 80 and over</term>
<term>Cadaver</term>
<term>Humans</term>
<term>Male</term>
<term>Phantoms, Imaging</term>
<term>Radiation Dosage</term>
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<front><div type="abstract" xml:lang="en">For several radiological examinations, a clinician can select between conventional and spiral computed tomography. Using both techniques, this study aimed at evaluating the difference in absorbed doses when examining a single lateral jaw segment in a human cadaver head and Rando phantom. The present study involved the placement of thermoluminescent dosimeter (TLD) chips (GR-200) in the thyroid gland, and bilaterally, in the parotid and submandibular glands and the lenses of the eyes in both a human cadaver and a Rando phantom at corresponding locations. Consecutive conventional spiral tomographic examinations were carried out in both the left upper and lower premolar area, using a Cranex TOME multifunctional unit. Each examination consisted of 4 slices with a 2 mm slice thickness and exposure parameters of 57 kV, 56 seconds and 1.6-2.0 mA. Regarding spiral computed tomography (CT), a Somatom Plus S scanner (Siemens, Erlangen, Germany), with a slice thickness of 1 mm with settings at 120 kV and 165 mA, was used on both phantoms and separately in the upper and lower jaw. With conventional tomography, the findings of the present study showed that the parotid and submandibular glands on the side near the X-ray tube received the highest dose, both for the cadaver head (doses ranging from 0.5 to 1.3 mGy) and the phantom (doses ranging from 0.6 to 2.6 mGy). For CT of the upper jaw, the highest doses were delivered to the parotid glands with an average absorbed dose of 9.2 and 10.6 mGy for the cadaver head and phantom, respectively. The submandibular glands received the highest doses during CT examination of the lower jaw with an average of 7.8 and 12.9 mGy for the cadaver head and phantom, respectively. It appears from the present investigation that if small edentulous regions are examined, radiation doses during conventional tomography remain much lower than during CT imaging. However, when multiple tomographic cuts are required, a spiral CT examination can replace a series of conventional examinations, especially in cases such as the rehabilitation of an edentulous upper jaw or a more complex surgery.</div>
</front>
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<Title>Clinical oral implants research</Title>
<ISOAbbreviation>Clin Oral Implants Res</ISOAbbreviation>
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<ArticleTitle>Absorbed doses from spiral CT and conventional spiral tomography: a phantom vs. cadaver study.</ArticleTitle>
<Pagination><MedlinePgn>473-8</MedlinePgn>
</Pagination>
<Abstract><AbstractText>For several radiological examinations, a clinician can select between conventional and spiral computed tomography. Using both techniques, this study aimed at evaluating the difference in absorbed doses when examining a single lateral jaw segment in a human cadaver head and Rando phantom. The present study involved the placement of thermoluminescent dosimeter (TLD) chips (GR-200) in the thyroid gland, and bilaterally, in the parotid and submandibular glands and the lenses of the eyes in both a human cadaver and a Rando phantom at corresponding locations. Consecutive conventional spiral tomographic examinations were carried out in both the left upper and lower premolar area, using a Cranex TOME multifunctional unit. Each examination consisted of 4 slices with a 2 mm slice thickness and exposure parameters of 57 kV, 56 seconds and 1.6-2.0 mA. Regarding spiral computed tomography (CT), a Somatom Plus S scanner (Siemens, Erlangen, Germany), with a slice thickness of 1 mm with settings at 120 kV and 165 mA, was used on both phantoms and separately in the upper and lower jaw. With conventional tomography, the findings of the present study showed that the parotid and submandibular glands on the side near the X-ray tube received the highest dose, both for the cadaver head (doses ranging from 0.5 to 1.3 mGy) and the phantom (doses ranging from 0.6 to 2.6 mGy). For CT of the upper jaw, the highest doses were delivered to the parotid glands with an average absorbed dose of 9.2 and 10.6 mGy for the cadaver head and phantom, respectively. The submandibular glands received the highest doses during CT examination of the lower jaw with an average of 7.8 and 12.9 mGy for the cadaver head and phantom, respectively. It appears from the present investigation that if small edentulous regions are examined, radiation doses during conventional tomography remain much lower than during CT imaging. However, when multiple tomographic cuts are required, a spiral CT examination can replace a series of conventional examinations, especially in cases such as the rehabilitation of an edentulous upper jaw or a more complex surgery.</AbstractText>
</Abstract>
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<ForeName>C</ForeName>
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<AffiliationInfo><Affiliation>Department of Periodontology, Oral Imaging Cluster, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium.</Affiliation>
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