Main Logo

Society for Pediatric Radiology – Poster Archive

Micro Ct
Showing 3 Abstracts.

Hutchinson J.,  Haig Ian,  Sebire Neil,  Arthurs Owen

Final Pr. ID: Poster #: CR-008

Autopsy examination of early miscarriages (<20 weeks’ gestation) can be technically challenging, with an associated error rate due to small size. Imaging is increasingly used to guide the autopsy process and post mortem MRI (PMMRI) at 1.5T shows excellent correlation with autopsy findings over 18gw / 500g bodyweight, however, its diagnostic accuracy is reduced below these thresholds. We have evaluated the use of Micro-CT, which has been used in animal imaging and industry for many years. We present a radiological / pathological correlation of a case from the first clinical use of micro-CT in perinatal autopsy practice, under an ethically approved study with full consent.

A termination of pregnancy was performed at approximately 14gw for presumed sacrococcygeal teratoma. Standard CT and 1.5T PMMRI was non-diagnostic for every organ system. Following immersion of the fetus in potassium triiodide and formalin for 48 hours, a micro-CT scan was performed using a Nikon XTH225 micro-CT scanner, reconstructed using proprietary software (CT Pro 3D, Nikon Metrology) and post-processed using VG Studio MAX (Volume Graphics GmbH).

Views of all organ systems were obtained that were used to guide subsequent unblinded autopsy. Micro-CT demonstrated multiple abnormalities, including amniotic membranes in contact with the fetal skin, multiple disruptions of the abdomen and limbs, and externalisation of internal organs including the kidneys and liver. These were confirmed at the subsequent autopsy and a final diagnosis of ADAM complex (amniotic deformity, adhesions, mutilations) was made.

This case report demonstrates the potential of micro-CT to provide detailed PM imaging of entire fetuses whilst maintaining tissue integrity, allowing pre-autopsy identification of multiple congenital abnormalities in cases where 1.5T PMMRI and standard CT fail to achieve diagnostic resolutions.
Read More

Authors:  Hutchinson J. , Haig Ian , Sebire Neil , Arthurs Owen

Keywords:  Micro-CT, Fetal, Anomalies, Congenital, Postmortem

Hutchinson J.,  Peltzer Maria,  Darding Maurice,  Walczak Henning,  Sebire Neil,  Arthurs Owen

Final Pr. ID: Poster #: CR-007

Retention of embryonic tissue for teaching and research has become complex for medicolegal reasons following numerous organ retention issues. Virtual datasets of embryos would allow anatomical diagnosis and are both less controversial and simpler to obtain and store. Several imaging techniques are now available (High field MRI and micro-CT) which alleviate the need to dissect the tissue to create serial sections, thus maintaining tissue integrity.

We present a series of images from phenotypically normal and abnormal mouse embryos (length 4-5mm) obtained using micro-CT. Three mouse embryos were immersed in potassium triiodide for 24 hours prior to being individually immobilised using non-nutrient agar. Images were acquired using a Nikon XTH225 micro-CT scanner, reconstructed using proprietary software and post-processed using VG StudioMAX.

Excellent internal contrast was demonstrated in all specimens, with all organ systems delineated. Excellent views of normal central nervous system, respiratory system, cardiovascular system, genitourinary and digestive tract systems were also obtained at micrometer resolution. Specific abnormalities identified include a possible VSD (0.24mm), exencephaly and foreface disruption.

Micro-CT technology can be used to create datasets of embryos at high resolution (up to 3.7 micrometers achieved), which can then be re-dissected, 3D printed or indefinitely stored and could provide a solution to current issues affecting the use of embryonic tissue for diagnosis, teaching and research.
Read More

Authors:  Hutchinson J. , Peltzer Maria , Darding Maurice , Walczak Henning , Sebire Neil , Arthurs Owen

Keywords:  Micro-CT, Fetal, phenotype